Spontaneity Weird

Whenever you cast your first spell each turn, put either a +1/-1 counter or a -1/+1 counter on Spontaneity Weird at random.
Whenever Spontaneity Weird attacks or blocks,
you may have it get +3/-3 or -3/+3
until end of turn.
"Note: May have gone a bit short on the
element-to-plasma ratio."
—Izzet experiment log