Primordial Gnawer

Creature — Insect Horror

When this creature dies, discover 3. (Exile cards from the top of your library until you exile a nonland card with mana value 3 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

Cave crawlers devour anything from plant matter to solid rock, but they prefer fresh meat.