Bifur, Melodic Rider (HOB-147) - The Hobbit Foil

Storied (If you control three or more artifacts, legendaries, andlor Sagas, you have an enduring story for the rest of the game.)

Whenever Bifur enters or attacks, put a +1/+1 counter on target creature.

As long as you have an enduring story, if an ability of a Dwarf you control triggers, that ability triggers an additional time.