Unstable, lifelink (3)
Whenever another artifact you control enters, put a +1/+1 counter on Jackknight. If that artifact is a Contraption, Jackknight gains lifelink until end of turn.
Whenever you crank Quick-Stick Lick Trick, target creature gets +1/+1 and gains lifelink until end of turn.
Target creature gets +2/+2 until end of turn. If it's a host or has augment, it gains lifelink until end of turn.
Gatherer works better in the Companion app!