The call of Emhos

You may play skeleton
spells this turn for {2} less.
If you paid {b}{b} to cast this
spell deal 2 damage to any target.
If you paid {w}{w} to cast this spell
regenerate target creature. if you paid
{w}{b} gain 2 life.
_______________________
The skeletons head turned to north.
I watched ashen faced. Something was
calling them.