Deft Infiltrator

When Deft Infiltrator enters the battlefield, if its
stalk cost was paid, attach any number of Swords and/or Shields you control to Deft Infiltrator.
Stalk {5}{r}{r} (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.)