King of the Monsters

Whenever King of the Monsters or another
Dinosaur enters the battlefield under your
control, you may discover X, where X is that
creature’s toughness. Do this only once each
turn. (Exile cards from the top of your library
until you exile a nonland card with that mana
value 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.)