Seraphina, Aether Saboteur

Whenever a creature you control attacked and is
not blocked, you get {e} (an energy counter)
Whenever an artifact you control is destroyed, if
you have 6 or more energy counters, you may
return it from your graveyard to your hand.
Pay {e}{e}, {t}: Tap target artifact, it doesn't untap
on it's controller's next untap step.
"All it took was a flick, and a bit of mischief"