Finders, Keepers
{5}{B}
Sorcery
Destroy target creature, then assemble a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.)
First Pick
{3}{G}
Instant
Destroy target artifact or enchantment. Assemble a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.)
Spell Suck
{2}{U}{U}
Instant
Counter target spell, then assemble a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.)