Stormquill

Whenever equipped creature takes damage or
becomes the target of a spell or ability, put a
charge counter on Stormquill.
Equipped creature gets +1/+0 for each charge
counter on Stormquill and has prowess and
"{t}, Remove 5 charge counters from Stormquill:
Deal 7 damage divided as you choose between
any number of targets."
Equip {4}