Hallar, the Firefletcher [Dominaria]

Set: Dominaria Type: Legendary Creature — Elf Archer Rarity: Uncommon Cost: {1}{R}{G} TrampleWhenever you cast a spell, if that spell was kicked, put a +1/+1 counter on Hallar, the Firefletcher, then Hallar deals damage equal to the number of +1/+1 counters on it to each opponent.