Spark of Invention

Begin the game with this out of deck in play.
Spark of Invention enters play with shroud.
-When you cast an artifact put X counters on Spark X = CMC. If it has more then 14 counters it loses this ability & shroud.
-It gains: {t} remove X counters from Spark to cast
an artifact from your graveyard X = CMC and cast
it without paying its mana cost. If that artifact
leaves play, remove it from the game. If Spark has
no counters on it remove it from the game.