Rising-Roc Idol

Whenever another artifact enters the battlefield
under your control, you may have Rising-Roc
Idol become a 2/2 Phoenix artifact creature with flying until end of turn.
{1}{r}: Rising-Roc Idol becomes a 2/2 Phoenix artifact creature with flying until end of turn.
Whenever Rising-Roc Idol attacks, you may
sacrifice an artifact. If you do, Rising-Roc Idol
deals 1 damage to target creature.