Nitro-9 — Whenever Ace, Fearless Rebel attacks, you may sacrifice an artifact. When you do, put a +1/+1 counter on Ace, Fearless Rebel, then it fights up to one target creature defending player controls.

Doctor's companion (You can have two commanders if the other is the Doctor.)

Emerge (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.)

When Adipose Offspring enters the battlefield, create a 2/2 white Alien creature token. If Adipose Offspring's emerge cost was paid, instead create X of those tokens, where X is the sacrificed creature's toughness.

Whenever you cast a historic spell, create a 1/1 white Soldier creature token. (Artifacts, legendaries, and Sagas are historic.)

Whenever Alistair attacks, you may pay . If you do, creatures you control get +X/+X until end of turn, where X is the number of historic permanents you control.

Partner with Rory Williams (When this creature enters the battlefield, target player may put Rory into their hand from their library, then shuffle.)

Whenever Amy Pond deals combat damage to a player, choose a suspended card you own and remove that many time counters from it.

Doctor's companion (You can have two commanders if the other is the Doctor.)

: Add one mana of any color in your commander's color identity.

: Add .

Basic landcycling (, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)

Whenever Astrid Peth enters the battlefield or attacks, create a Food token.

Brand-new Sky — Whenever you sacrifice a Clue or Food, Astrid Peth explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

You may have Auton Soldier enter the battlefield as a copy of any creature on the battlefield, except it isn't legendary, is an artifact in addition to its other types, and has myriad. (Whenever it attacks, for each opponent other than defending player, you may put a token that's a copy of this creature onto the battlefield tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)

History Teacher — Sagas you control have read ahead. (As a Saga enters the battlefield, choose a chapter and start with that many lore counters. Skipped chapters don't trigger.)

Doctor's companion (You can have two commanders if the other is the Doctor.)

Enchant noncommander creature

You control enchanted creature.

Enchanted creature gets +2/+2 and can't be blocked unless it's attacking its owner or a permanent its owner controls.

Enchant artifact or land

Enchanted permanent has ": Target player adds two mana of any one color. The next spell they cast this turn has cascade." (When they cast their next spell, they exile cards from the top of their library until they exile a nonland card that costs less. They may cast it without paying its mana cost. They put the exiled cards on the bottom in a random order.)

This spell costs less to cast for each creature on the battlefield.

Blasphemous Act deals 13 damage to each creature.

(: Add or .)

Canopy Vista enters the battlefield tapped unless you control two or more basic lands.

At the beginning of each of your main phases, if you haven't added mana with this ability this turn, you may add X mana of any one color, where X is the number of Islands target opponent controls.

The owner of target permanent shuffles it into their library, then reveals the top card of their library. If it's a permanent card, they put it onto the battlefield.

(: Add or .)

Cinder Glade enters the battlefield tapped unless you control two or more basic lands.

Impossible Girl — If Clara Oswald is your commander, choose a color before the game begins. Clara Oswald is the chosen color.

If a triggered ability of a Doctor you control triggers, that ability triggers an additional time.

Doctor's companion (You can have two commanders if the other is the Doctor.)

You may exert Clockwork Droid as it attacks. When you do, it can't be blocked this turn and you scry 1. (An exerted creature won't untap during your next untap step. To scry 1, look at the top card of your library. You may put that card on the bottom.)

: Add one mana of any color in your commander's color identity.

Sacrifice Commander's Sphere: Draw a card.

Target creature can't block this turn and becomes a Coward in addition to its other types until end of turn.

Time travel.

Creeping Tar Pit enters the battlefield tapped.

: Add or .

: Creeping Tar Pit becomes a 3/2 blue and black Elemental creature until end of turn and can't be blocked this turn. It's still a land.

Crumbling Necropolis enters the battlefield tapped.

: Add , , or .

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

Turn target creature face down. It's a 2/2 Cyberman artifact creature.

Skulk (This creature can't be blocked by creatures with greater power.)

Whenever Cybermat attacks and isn't blocked, it gets +X/+0 until end of turn, where X is the number of attacking artifact creatures.

Flying

Whenever Cybership deals combat damage to a player, put the top two cards of that player's library onto the battlefield face down under your control. They're 2/2 Cyberman artifact creatures.

Crew 4

Menace

Myriad (Whenever this creature attacks, for each opponent other than defending player, you may create a token that's a copy of this creature that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)

Creatures you control have "Whenever one or more counters are put on this creature for the first time each turn, draw a card."

Menace

At the beginning of your end step, create a 3/3 black Dalek artifact creature token with menace if an opponent lost 3 or more life this turn. Then each opponent who lost 3 or more life this turn faces a villainous choice — You draw a card, or that player discards a card.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)

I, II, III — Choose a creature card name, then goad all creatures with a name chosen for Day of the Moon. (Until your next turn, they attack each combat if able and attack a player other than you if able.)

Discard all the cards in your hand, then draw that many cards.

Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.)

Deserted Beach enters the battlefield tapped unless you control two or more other lands.

: Add or .

Vigilance, trample

Other Dinosaurs you control get +1/+1 and have vigilance and trample.

Suspend 4—

Whenever a time counter is removed from Dinosaurs on a Spaceship while it's exiled, create a 2/2 red and white Dinosaur creature token with flying and haste.

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

Whenever Donna or a creature it's paired with is dealt damage, Donna deals that much damage to target opponent.

Doctor's companion (You can have two commanders if the other is the Doctor.)

Choose X. You may choose the same mode more than once.

• Each player sacrifices a nonartifact creature.

• Create a 3/3 black Dalek artifact creature token with menace.

• Each opponent discards a card.

Dreamroot Cascade enters the battlefield tapped unless you control two or more other lands.

: Add or .

Duggan's power and toughness are each equal to the number of cards in your hand.

Whenever Duggan enters the battlefield or attacks, investigate.

The Most Important Punch in History — , : Duggan deals damage equal to twice its power to another target creature. Activate only once.

Each opponent faces a villainous choice — They exile cards from the top of their library until they exile a nonland card, then you may cast that card without paying its mana cost, or that player exiles the top four cards of their library and Ensnared by the Mara deals damage equal to the total mana value of those exiled cards to that player.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)

Exile all creatures except those that share a creature type with a creature that convoked this spell, all artifacts, and all enchantments.

: Add one mana of any color that a land an opponent controls could produce.

Replicate—Tap an untapped Dalek you control. (When you cast this spell, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)

Destroy target creature. Its controller loses 3 life.

Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.

(: Add or .)

Fetid Pools enters the battlefield tapped.

Cycling (, Discard this card: Draw a card.)

Five Hundred Year Diary enters the battlefield tapped.

: Add for each Clue you control.

, Sacrifice Five Hundred Year Diary: Draw a card.

Creatures your opponents control have base power and toughness 0/1 until end of turn.

As Foreboding Ruins enters the battlefield, you may reveal a Swamp or Mountain card from your hand. If you don't, Foreboding Ruins enters the battlefield tapped.

: Add or .

As Fortified Village enters the battlefield, you may reveal a Forest or Plains card from your hand. If you don't, Fortified Village enters the battlefield tapped.

: Add or .

Exile target nonland permanent. Each player other than its controller creates a token that's a copy of it.

When Frost Fair Lure Fish enters the battlefield, create two 1/1 blue Fish creature tokens and create two tapped Treasure tokens.

Fish you control have haste and can't be blocked by Humans.

Foretell

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)

I — Create a 1/1 white Human creature token with ward and a 4/4 white Alien Rhino creature token.

II — Investigate.

III — You may exile a Human you control and an artifact you control. If you do, search your library for a Doctor card, put it onto the battlefield, then shuffle.