Savage Portent

Scry 3, then reveal the top card of your library. Creatures you control get +X/+X until end of turn, where X is that card's
mana value. If X is 5 or greater, creatures
you control gain trample until end of turn.
(To scry 3, look at the top three cards of your library, then put any number of them on the bottom of your library and the rest on top in
any order.)