Jackknight

When this creature enters, roll a six-sided die. You gain life equal to the result.

Flying 3W, Sacrifice another artifact: This creature assembles a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.)

Sacrifice this creature: Destroy target enchantment.

Sacrifice this creature: Destroy target enchantment.

Sacrifice this creature: Destroy target enchantment.

Sacrifice this creature: Destroy target enchantment.

1W, Remove a counter from a permanent you control: Create a 1/1 colorless Gnome artifact creature token. 1W, Sacrifice an artifact: Choose any kind of counter a printed card refers to, then put one of that counter on target permanent.

Flying When this creature enters, return a creature you control to its owner's hand unless you compliment an opponent.