Rakdos Tinker

Artifice {2}(Whenever this permanent enters the battlefield, you may exile target artifact you control
with a mana cost {2} or less, and return it to play
under its owner's control.)
Sacrifice Rakdos Tinker: Add {b/r}. This mana
can only be used to cast an instant or sorcery.
{t}: Add {1}. If this mana is not used to cast a
spell with Necro, Glamer or Artifice, sacrifice
Dimir Tinker.