Imoti, Celebrant of Bounty is a uncommon Legendary Creature — Snake Druid card from Magic Online Promos (PRM), collector number 86278.
Cascade (When you cast this 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.) Spells you cast with mana value 6 or greater have cascade.