SOUL

Indestructible
When a creature with a +1/+1 counter from this artifact is destroyed, exile it. At the beginning of your upkeep, return that creature to your hand.

{2}, {t}: Put a +1/+1 counter on target creature you control.

Unleash - {4}, {t}: Double the number of +1/+1 counters on target creature. Activate only as a sorcery.

"That's your SOUL, the culmination of your being!"