Rage Forger is a uncommon Creature — Elemental Shaman card from Jumpstart: Historic Horizons (J21), collector number 496.
When this creature enters, put a +1/+1 counter on each other Shaman creature you control. Whenever a creature you control with a +1/+1 counter on it attacks, you may have that creature deal 1 damage to target player or planeswalker.