Blood of the Covenant

You may deal 1 damage to upto 3 creatures you control as you cast this spell. If you do, this spell
cost {1} less to cast for every creature dealt damage
this way.
Return target creature card from your graveyard
to the battlefield. It enters the battlefield with an additional +1/+1 counter for every creature dealt damage to reduce the cost of this spell as it was
casted.