Gerki, Tin Street Anarchist

Haste, Menace
Whenever Gerki, Tin Street Anarchist deals
combat damage to a player, exile target artifact
that player controls. As long as you control a
rogue, you may cast cards exiled this way for as
long as they remain exiled and you may spend
mana as though it were mana of any color to cast
it.
{b}{r}, Sacrifice an artifact: Gerki, Tin Street Anarchist becomes unblockable this turn.