Raze's Workshop

Whenever an artifact enters the battlefield you may pay {3}, if you do create a C4 explosive with ( {t}{2}: Deal 3 damage to any target).
Whenever an artifact leaves the battlefield you may {5}, if you do exile that artifact under Raze's Workshop with tinker counters equal to the cards converted mana cost. Whenever an artifact enters the battlefield remove a tinker counter from that card. When there are no more counters on it return it to the battlefield. If there is an X cost play it using 2.