Brianna, Wildfire Spiritbonder gets +1/+1 for each ember counter on it.

Whenever you exile a creature card you own, put an ender counter on Brianna. Then Brianna deals X damage to any target, where X is the number of ember counters on it.

{1}{R}{G}{T}: Target attacking creature gets+3/+0 and can't be blocked this turn. Exile it at the end of combat.