Yidris, Maelstrom Wielder is a mythic Legendary Creature — Ogre Wizard card from Commander 2016 (C16), collector number 50. Current market price: — (foil $11.81), TCGplayer market prices via Scryfall.
Trample Whenever Yidris 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.)