Pantlaza, Sun-Favored

Whenever Pantlaza, Sun-Favored 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.)