Sheevair of the Horizon

Emerge {10}{g}
Sheevair enters the battlefield with a number of
doom counters on it equal to the power of the creature sacrificed to its emerge cost.
Whenever Sheevair attacks, create a 0/0 colorless Fractal creature token for each creature on the battlefield. Then put X +1+1 counters on each
Fractal you control, where X is the number of
doom counters on Sheevair.