Yidris, Maelstrom Wielder

Trample
Whenever Yidris, Maelstrom Wielder deals combat damage to a player, as you cast spells from your hand this turn, they gain cascade. (When you cast the spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)

Acid Rain

Hellfire

Destroy all nonblack creatures. Hellfire deals X plus 3 damage to you, where X is the number of creatures that died this way.

Nature's Ruin

Perish

Destroy all green creatures. They can't be regenerated.

Tsunami

Boil

Boiling Seas

Reign of Terror

Destroy all green creatures or all white creatures. They can't be regenerated. You lose 2 life for each creature that died this way.

Return of the Nightstalkers

Return all Nightstalker permanent cards from your graveyard to the battlefield. Then destroy all Swamps you control.

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