The Real Omnitrix

Indestructible
Creatures you own named Ben 10, Omniversal
Hero have "{x}: Exile this creature. Then
return it to the battlefield as a copy of up to
one Alien permanent card you own in exile
or from outside the game with mana value X
until your next turn, except its name is still
Ben 10, Omniversal Hero. It gains haste."

{t}: Exile target Alien spell or permanent you
own.