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Trample

Counter target spell with mana value X. (For example, if that spell’s mana cost is , X is 5.)

You gain life equal to the damage dealt to you this turn. Simulacrum deals damage to target creature you control equal to the damage dealt to you this turn.

: Counter target black spell.

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Flying

Flying (This creature can’t be blocked except by creatures with flying or reach.)
Nightmare’s power and toughness are each equal to the number of Swamps you control.

Other Zombie creatures have swampwalk. (They can’t be blocked as long as defending player controls a Swamp.)
Other Zombies have “: Regenerate this permanent.”

: You may choose a creature card in your hand whose mana cost could be paid by some amount of, or all of, the mana you spent on . If you do, you may cast that card face down as a 2/2 creature spell without paying its mana cost. If the creature that spell becomes as it resolves has not been turned face up and would assign or deal damage, be dealt damage, or become tapped, instead it’s turned face up and assigns or deals damage, is dealt damage, or becomes tapped. Activate only as a sorcery.

Attacking creatures you control get +1/+0.

Nevinyrral’s Disk enters tapped.
, : Destroy all artifacts, creatures, and enchantments.

You may have Copy Artifact enter as a copy of any artifact on the battlefield, except it’s an enchantment in addition to its other types.

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Prevent all combat damage that would be dealt this turn.

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Whenever a player casts a black spell, you may pay . If you do, you gain 1 life.

Look at target opponent’s hand and choose a card from it. You control that player until Word of Command finishes resolving. The player plays that card if able. While doing so, the player can activate mana abilities only if they’re from lands that player controls and only if mana they produce is spent to activate other mana abilities of lands the player controls and/or to play that card. If the chosen card is cast as a spell, you control the player while that spell is resolving.

Target creature gains flying until end of turn.

At the beginning of your upkeep, sacrifice Conversion unless you pay .
All Mountains are Plains.

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Plague Rats’s power and toughness are each equal to the number of creatures named Plague Rats on the battlefield.

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