Ukreld, Prodigy Hunter

Whenever a Bear enters the battlefield under your control, put a +1/+1 counter on Ukreld, Prodigy Hunter
{g}{g}{t}: Bears you control get +X/+X where X is Ukreld's power
Other Bears you control have "{g}{g}{t}: This creatures fights target creature you don't control"
Revenge I seek, and revenge I will have