Grimoire of the Sultai

(As long as this card is on the stack, you may activate
any of these abilities. If this spell is countered, counter
all abilities that would be activated.)
{u}: Return target creature with a +1/+1 or -1/-1 counter to its owners hand.
{b}: Target creature gets a -1/-1 counter for each
+1/+1 counter on the field.
{g}: Target green creature gets a +1/+1 counter
for each -1/-1 counter on the field.