Card Text:
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 non land card that costs less.You may cast it without paying it's mana cost. Put the exiled cards on the bottom of the library in a random order.)