Infernal Pet 2B
Creature - Imp
Whenever you cast your second spell each turn, put a +1/+1 counter on Infernal Pet. It gains flying until end of turn. "Look, my pet. Another light to extinguish."
—Kzarakh, Immersturm guardian
In Limited, it helps the WB second-spell archetype. In Constructed, probably play this with blue and not white.