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.)
Non Foil / Near Mint - $8.94
Non Foil / Slightly Played - $8.05
Non Foil / Moderately Played - $7.15
Non Foil / Heavily Played - $5.36
Non Foil / Damaged - $4.47