Lab Rats
{B}
Sorcery
Buyback {4} (You may pay an additional {4} as you cast ~this~. If you do, put ~this~ into your hand as it resolves.)
Create a 1/1 black Rat creature token.
Piper of the Swarm
{1}{B}
Creature -- Human Warlock
1/3
Rats you control have menace.
{1}{B}, {T}: Create a 1/1 black Rat creature token.
{2}{B}{B}, {T}, Sacrifice three Rats: Gain control of target creature.