Deoxys

Flying, first strike, haste.
{1}, {t}: Deoxys deals damage equal to its power
to target creature. {3}: Regenerate Deoxys. (The next time Deoxys
would be destroyed this turn, it isn't. Instead tap it,
remove all damage from it, and remove it from
combat.)
Sacrifice Deoxys: Search your library or
graveyard for a Alien Mutant Wizard legendary
creature card, put it on the battlefield tapped,
then shuffle your library.