Oracle Text

Echo 4 (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

Sacrifice an artifact: Put a +1/+1 counter on target creature.

Card Rulings

10/4/2004 It can choose itself as the target, but it will be countered when it tries to resolve since it will no longer be on the battlefield. This is useful only when you want to simply destroy this card.