Math Madness

At the beginning of your upkeep, put a stretch
counter and a shrink counter on Math Madness.
At the beginning of your end step, for each
stretch counter on Math Madness, you gain 1
life, and for each shrink counter on Math
Madness, target opponent loses 1 life.
Goblin 1: Mersinger should stick to jackanapes...
Goblin 2: Nothing sticks to jackanapes. Believe me, I
tried all sorts of glue!...