Doctor Octopus

Sinister
Agility (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)
Return a nonland permanent you control to its
owner's hand, {t}: Invent (Create a colorless
Invention artifact token with "{2}, Sacrifice this
artifact: You get {e}{e}; or put a +2/+3 counter on
target creature.")