The God Killer Bat

Begin the game with this card revealed.
Once per turn, select one creature you control.
It gains indestructible, double-strike, haste,
deathtouch, lifelink, trample, reach and
has "Enrage-when this creature is
dealt damage, exile target permanent"
and "if this card is destroyed, exile all
nonland permanents."
You can only control one creature at any
given time but creatures you control
have flash, and haste.