Tesla, The Lost Genius

Tesla Coil Engine: At the beggining of each upkeep,
put a {e} counter on each artifact you control.
Artifacts you control have: "This artifact reduce in {c} its activated ability costs for each {e} counter on
it", and "If this artifact has 5 or more {e} counters, sacrifice it at the end of the turn, then destroy
another permanent with less or equal mana cost
than this card".