M'hiafu, Mana Tamer

As steps and phases end —
• For each {w} that would empty from your mana
pool, you gain 1 life
• For each {r} that would empty from your mana
pool, M'hiafu, Mana Tamer deals 1 damage to any target
• For each {g} that would empty from your mana
pool, put a +1/+1 counter on target creature