Wandertale Mentor [Bloomburrow]

Set: Bloomburrow Type: Creature — Raccoon Bard Rarity: Uncommon Cost: {R}{G} Whenever you expend 4, put a +1/+1 counter on Wandertale Mentor. (You expend 4 as you spend your fourth total mana to cast spells during a turn.){T}: Add {R} or {G}. You've all grown much since I passed through this burrow last! Let's see, where to begin this story?