Heretical Cleric

Lifelink
When Heretical Cleric enters the battlefield, if its
stalk cost was paid, target creature gets -1/-1 until
end of turn. You gain 1 life.
Stalk {1}{w} (At the end of each block step, if there is
an unblocked creature attacking you, you may cast
this card for its stalk cost. If you do, choose an
unblocked creature attacking you. This creature blocks
that creature.)