As an additional cost to cast this spell, sacrifice a land.

Search your library for up to two basic land cards, put them onto the battlefield, then shuffle.

, , Pay 1 life, Discard a card: Draw a card, mill a card, then put a ritual counter on Heirloom Mirror. Then if it has three or more ritual counters on it, remove them and transform it. Activate only as a sorcery.

Flying, vigilance

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

When an opponent casts an artifact spell, if Hidden Guerrillas is an enchantment, Hidden Guerrillas becomes a 5/3 Soldier creature with trample.

Create two 1/1 colorless Sliver creature tokens.

: Homarid Warrior gains shroud until end of turn and doesn't untap during your next untap step. Tap Homarid Warrior. (A creature with shroud can't be the target of spells or abilities.)

Molting Exoskeleton — When Hook Horror dies, it perpetually gets -1/-1. Then if that card's toughness is 1 or greater, return it to the battlefield under its owner's control.

Devoid (This card has no color.)

Counter target creature spell with mana value 4 or less. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Sacrifice a Swamp: Regenerate target black creature. (The next time that creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.)

: Horror of the Dim gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)

+2: You gain life equal to the greatest power among creatures you control.

0: Create a 3/3 green Dinosaur creature token with trample.

−X: Huatli, Warrior Poet deals X damage divided as you choose among any number of target creatures. Creatures dealt damage this way can't block this turn.

Flash

This spell can't be countered.

Whenever you cast a spell, choose up to one —

• Return target spell you don't control to its owner's hand.

• Return target nonland permanent to its owner's hand.

: Target creature can't be regenerated this turn.

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

As Illusionary Terrain enters the battlefield, choose two basic land types.

Basic lands of the first chosen type are the second chosen type.

Haste

Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Enchant creature

Enchanted creature gets +2/+0 and has "When this creature dies, draw a card."

Flying

Enchant permanent

Enchanted permanent can't attack, block, or crew Vehicles. Its activated abilities can't be activated unless they're mana abilities.

Changeling (This card is every creature type.)

When Irregular Cohort enters the battlefield, create a 2/2 colorless Shapeshifter creature token with changeling.

When Irreverent Revelers enters the battlefield, choose one —

• Destroy target artifact.

• Irreverent Revelers gains haste until end of turn.

Irrigation Ditch enters the battlefield tapped.

: Add .

, Sacrifice Irrigation Ditch: Add .

Kicker

When Jace, Mirror Mage enters the battlefield, if Jace was kicked, create a token that's a copy of Jace, Mirror Mage, except it's not legendary and its starting loyalty is 1.

+1: Scry 2.

0: Draw a card and reveal it. Remove a number of loyalty counters equal to that card's mana value from Jace, Mirror Mage.

First strike, haste

: Jeska, Warrior Adept deals 1 damage to any target.

Whenever Joven's Ferrets attacks, it gets +0/+2 until end of turn.

At end of combat, tap all creatures that blocked Joven's Ferrets this turn. They don't untap during their controller's next untap step.

Defender (This creature can't attack.)

When Jungle Barrier enters the battlefield, draw a card.

Flying, haste

When Karrthus, Tyrant of Jund enters the battlefield, gain control of all Dragons, then untap all Dragons.

Other Dragon creatures you control have haste.

Khalni Territory enters the battlefield tapped.

: Add .

Other Plants and Treefolk you control get +2/+0.

At the beginning of your postcombat main phase, return target Plant, Treefolk, or land card from your graveyard to your hand.

Convoke

When Knight-Errant of Eos enters the battlefield, look at the top six cards of your library. You may reveal up to two creature cards with mana value X or less from among them, where X is the number of creatures that convoked Knight-Errant of Eos. Put the revealed cards into your hand, then shuffle.

At the beginning of the end step, if Krovikan Horror is in your graveyard with a creature card directly above it, you may return Krovikan Horror to your hand.

, Sacrifice a creature: Krovikan Horror deals 1 damage to any target.

Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)

: Tap target creature.

Horsemanship (This creature can't be blocked except by creatures with horsemanship.)

When Lashknife Barrier enters the battlefield, draw a card.

If a source would deal damage to a creature you control, it deals that much damage minus 1 to that creature instead.

Whenever an opponent draws a card except the first one they draw in each of their draw steps, put a +1/+1 counter on Leela, Sevateem Warrior.

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

At the beginning of your end step, put a +1/+1 counter on each creature that attacked this turn.

Sacrifice Lightshield Array: Creatures you control gain hexproof and indestructible until end of turn.

Littjara Mirrorlake enters the battlefield tapped.

: Add .

, , Sacrifice Littjara Mirrorlake: Create a token that's a copy of target creature you control, except it enters the battlefield with an additional +1/+1 counter on it. Activate only as a sorcery.

Lonely Arroyo enters the battlefield tapped.

When Lonely Arroyo enters the battlefield, it deals 1 damage to target opponent.

: Add or .

Protection from modified creatures. (Modified creatures have a power, toughness, or ability different than their printed version.)

At the beginning of each player's end step, you may put a +1/+1 counter on target creature that player controls.

Companion — Each permanent card in your starting deck has mana value 2 or less. (If this card is your chosen companion, you may put it into your hand from outside the game for as a sorcery.)

Lifelink

Once during each of your turns, you may cast a permanent spell with mana value 2 or less from your graveyard.

When Maggot Carrier enters the battlefield, each player loses 1 life.

As an additional cost to cast this spell, you may exile any number of black cards from your hand. This spell costs less to cast for each card exiled this way.

March of Wretched Sorrow deals X damage to target creature or planeswalker and you gain X life.

Devour 2 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with twice that many +1/+1 counters on it.)

When Marrow Chomper enters the battlefield, you gain 2 life for each creature it devoured.

All Rats have fear.

, Sacrifice a Rat: Create X 1/1 black Rat creature tokens, where X is the number of Rats you control.

Destroy target land. Melt Terrain deals 2 damage to that land's controller.

At the beginning of your end step, untap all Merfolk you control.

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

When Merrow Harbinger enters the battlefield, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on top.