Yidris, Maelstrom Wielder (Gilded Foil) (SLD-455) - Secret Lair Drop: (Showcase) Foil

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.)