Rainbow of the void

Choose one of the following effects
Stargaze 1.
Deal 1 damage to any target
Put a -1/-1 counter on target creature.
Gain 1 life.
Untap a land.
Mana-split X.
(when casting this spell, you can also pay the Mana-split cost. If you do, create a copy of this card, for each color of mana used to pay the Mana-split cost.)