Sven, Kobold Genius

When Sven, Kobold Genius enters the battlefield, create
two 0/2 colorless Trap artifact creature tokens with defender.

{1}{r}{t}Place an explosive counter on an artifact you control.

Whenever an artifact you control with an explosive counter is put into the graveyard from play, have it do X damage to target creature, where X is that artifact's converted mana cost.