Engineer

{2}{t}, Create one:
-A 3/1 Sentry artifact creature token with defender, or a 7/3 Sentry with defender and first strike, and sacrifice target Sentry as an additional cost for the latter.
-A Dispenser artifact token with "{t}: Creatures you control get +1/+1 until end of turn."
-A Teleporter Exit artifact token with "{3}{t}, reveal a Teleporter Entrance in your hand: You may put a creature in your hand onto the battle- field without paying its casting cost."