Cure Wounds

Conjure {1}(If 1 or more +1/+1 counters has been
put on a creature or a player has gained 1 or more life
this turn, this spell costs {1} less to cast.)
If target creature would be dealt 1 or more
damage this turn, put 2 +1/+1 counters
on it first.
"Prevention is better than cure." - Desiderius Erasmus