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 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.)