Tezzeret, De-Sparker

Affinity for artifacts (This spell costs {1} less to play
for each artifact you control.)
When Tezzeret enters the battlefield, you may
search your library for an artifact or Nicol Bolas
planeswalker card. If you do, reveal it and put it
on top of your library.
Any damage Tezzeret deals to a non-Nicol Bolas
planeswalker is enough to destroy it.