Righteous Reaping

Enchanted creature has First Strike and "when it
deals excess damage to a creature you gain that
much life".
At the beginning of your end step, if you've
gained 3 life this turn you may Reconsider 1.
If the enchanted creature leaves the battlefield by
non-combat means, you may exile
this enchantment, then return that creature to
the battlefield tapped, you lose life equal to its
mana value.