Whenever this creature deals combat damage to a player, draw that many cards.

, Discard a card: This creature gets +1/+1 until end of turn.

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.)