Underchannel Smuggler

Whenever a creature you control blocks, you
may scry 1, draw a card, then you lose 1 life.
Stalk {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.)