Mana Maelstrom

Whenever you cast a spell, for each {w} spent to cast it, you gain 1 life, for each {u} spent to cast it, scry 1, for each {b} spent to cast it, target player mills a card,
for each {r} spent to cast it, Mana
Maelstrom deals 1 damage to any target, and
for each {g} spent to cast it, target creature
gets +1/+1 until end of turn.