Chryno, Parasite Grafter

Creatures that share Chryno, Parasite Grafters power and toughness have, {t}: Put a +1/+1 counter or a -1/-1 counter a creature, only you may activate this ability.
At the beginning of your upkeep if there
are nine or more creatures that share
Chryno, Parasite Grafter power and
toughness you win the game.