Ravenous Slime can't be blocked by creatures with power 2 or less.

If a creature an opponent controls would die, instead exile it and put a number of +1/+1 counters equal to that creature's power on Ravenous Slime.

When this creature enters, you may destroy target artifact or enchantment.

: Untap Retrofitter Foundry.

, : Create a 1/1 colorless Servo artifact creature token.

, , Sacrifice a Servo: Create a 1/1 colorless Thopter artifact creature token with flying.

, Sacrifice a Thopter: Create a 4/4 colorless Construct artifact creature token.

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for .)

Draw three cards.

Rocky Tar Pit enters tapped.

, Sacrifice Rocky Tar Pit: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.

Destroy target creature or planeswalker.

Awaken 4— (If you cast this spell for , also put four +1/+1 counters on target land you control and it becomes a 0/0 Elemental creature with haste. It's still a land.)

+1: Create a 1/1 colorless Servo artifact creature token.

+1: The next spell you cast this turn costs less to cast for each artifact you control as you cast it.

−7: For each artifact you control, create a token that's a copy of it. Those tokens gain haste. Exile those tokens at the beginning of the next end step.

Saheeli, the Gifted can be your commander.

Improvise (Each artifact you tap after you're done activating mana abilities pays for .)

Reveal the top X cards of your library. You may put any number of artifact cards with mana value X or less from among them onto the battlefield. Then put all cards revealed this way that weren't put onto the battlefield into your graveyard.

Savage Lands enters tapped.

: Add , , or .

This land enters tapped.

When this land enters, you gain 1 life.

: Add or .

At the beginning of your upkeep, if you control five or more lands, put four +1/+1 counters on Scute Mob.

Seaside Citadel enters tapped.

: Add , , or .

Secluded Steppe enters tapped.

: Add .

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

Landfall — Whenever a land you control enters, you may pay . If you do, draw a card.

Selesnya Sanctuary enters tapped.

When Selesnya Sanctuary enters, return a land you control to its owner's hand.

: Add .

Flying

Whenever an artifact creature you control deals combat damage to a player, you may create a 1/1 blue Thopter artifact creature token with flying.

: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever Silent-Blade Oni deals combat damage to a player, look at that player's hand. You may cast a spell from among those cards without paying its mana cost.

When you cast this spell, copy it for each time you've cast your commander from the command zone this game.

Each opponent sacrifices a creature of their choice. Each opponent who can't loses half their life, rounded up.

: Add .

Trample

: Permanents you control gain indestructible until end of turn.

, Exile Soul of New Phyrexia from your graveyard: Permanents you control gain indestructible until end of turn.

Flying

As Sower of Discord enters, choose two players.

Whenever damage is dealt to one of the chosen players, the other chosen player also loses that much life.

Flying

Shroud (This creature can't be the target of spells or abilities.)

You may look at the top card of your library any time.

Flying

: This creature gets +1/+0 until end of turn.

: Destroy each nonland permanent with mana value X whose controller was dealt combat damage by this creature this turn. Activate only once each turn.

Submerged Boneyard enters tapped.

: Add or .

Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control. It can attack and no matter when it came under your control.)

Equip (: Attach to target creature you control. Equip only as a sorcery.)

Haste

, : Copy target activated or triggered ability you control from an artifact source. You may choose new targets for the copy. (Mana abilities can't be targeted.)

: Add . Activate only if you control five or more lands.

, Sacrifice Terramorphic Expanse: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Draw three cards. Then discard two cards unless you discard an artifact card.

When Thopter Engineer enters, create a 1/1 colorless Thopter artifact creature token with flying.

Artifact creatures you control have haste. (They can attack and as soon as they come under your control.)

This land enters tapped.

When this land enters, you gain 1 life.

: Add or .

This land enters tapped.

When this land enters, you gain 1 life.

: Add or .

Tranquil Thicket enters tapped.

: Add .

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

Whenever an opponent taps an artifact for mana, gain control of that artifact until the end of your next turn.

Tuvasa the Sunlit gets +1/+1 for each enchantment you control.

Whenever you cast your first enchantment spell each turn, draw a card.

Enchant creature

When Unquestioned Authority enters, draw a card.

Enchanted creature has protection from creatures.

Untap all artifacts you control during each other player's untap step.

Whenever Varchild, Betrayer of Kjeldor deals combat damage to a player, that player creates that many 1/1 red Survivor creature tokens.

Survivors your opponents control can't block, and they can't attack you or planeswalkers you control.

When Varchild leaves the battlefield, gain control of all Survivors.

Metalcraft — Whenever Vedalken Humiliator attacks, if you control three or more artifacts, creatures your opponents control lose all abilities and have base power and toughness 1/1 until end of turn.

Enchant creature

Enchanted creature gets +2/+2, has flying, and can't attack you or planeswalkers you control.

: Add .

, , Sacrifice Warped Landscape: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

When Whirler Rogue enters, create two 1/1 colorless Thopter artifact creature tokens with flying.

Tap two untapped artifacts you control: Target creature can't be blocked this turn.

Enchant land

Whenever enchanted land is tapped for mana, its controller adds an additional .

Destroy all creatures that aren't enchanted. They can't be regenerated.

Create a 1/1 black and green Worm creature token for each land card in your graveyard.

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

Xantcha, Sleeper Agent enters under the control of an opponent of your choice.

Xantcha attacks each combat if able and can't attack its owner or planeswalkers its owner controls.

: Xantcha's controller loses 2 life and you draw a card. Any player may activate this ability.

Yavimaya Enchantress gets +1/+1 for each enchantment on the battlefield.

Commander ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand or the command zone tapped and attacking.)

Whenever a Ninja you control deals combat damage to a player, reveal the top card of your library and put that card into your hand. Each opponent loses life equal to that card's mana value.