Yidris, Maelstrom Wielder
Legendary Creature - Ogre Wizard
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 of your library in a random order.)
Legal Legacy
Legal Vintage
Not Legal Modern
Not Legal Standard
Not Legal Pioneer
Not Legal Pauper
Not Legal Historic
Legal Commander