Rainbow Dash

Flying, Haste, First Strike
20% Cooler - Whenever one or more creatures you
control deal combat damage to a player, draw a
card.
Sonic Rainboom - Whenever Rainbow Dash deals
combat damage to an opponent, you may pay {u/r}{u/r}. If you do, exile the top card of each
opponent's library. You may cast any number of spells from among them without paying their
mana costs.