Jay, Mad Dreadmaw

Trample
Whenever another Dinosaur or Wizard you
control attacks, exile the top X cards of your
library, where X is the number of Dinosaurs and Wizards attacking. Until end of turn, you may
cast one Instant or Sorcery from among the exiled
cards without paying its mana cost. Put the rest
on the bottom of your library in a random order.
{1}{u}{r}: Dinosaurs and Wizards you control gain +1/+0, Flying, and Trample until end of turn.