Malevolent Infiltrator

Deathtouch
Whenever Malevolent Inflitrator blocks or deals
combat damage to a player, put a -1/-1 counter
on up to one target creature and draw a card.
Stalk {1}{u}{b} (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.)