Royin the Kingslayer

Flying
Whenever Royin the Kingslayer deals combat damage, add your choice of {u} or {r} to your mana pool for each 1 point of damage to target opponent was dealt.
Sacrifice a spirit or enchantment, {t}: Draw two cards. If you have seven or more cards, create two 1/1 colorless spirit tokens and discard two cards at random.