Blossoming Bond

Vivid - g/u (Spend only green or blus mana on
this. It's all colors of mana spent to cast it.)
Put a Soulbond counter on target creature
you control. You may pair it with an
unpaired creature you control. Then, if it's
paired with a red or green creature, it 2 deals
damage to target creature. If it's paired with
a blue or black creature, instead tap that
creature and its controller loses 1 life.