Portal Gun

Portal gun enters the battlefield with a red portal
token and a blue portal token on it. Once per turn
you must choose one or sacrifice Portal Gun.
•Pay {u}: Move a blue portal token to target
creature.
•Pay {r}: Move a red portal token to target
creature with flying.
Creatures with a blue portal token on them have
flying. Creatures with a red portal token on them
get -0/-2. When a creature with a portal token on
it dies, move any portal tokens on it to Portal Gun