Releria of Nakar

Goldsword (Whenever this creature deals combat damage to a player, create a colorless artifact token named Gold with "Sacrifice this artifact: Add one
mana of any color to your mana pool.")
Releria of Nakar doesn't untap unless you control an artifact named Gold.
Sacrifice five Golds: Return Releria of Nakar from your graveyard to the battlefield, it gains haste. Sacrifce it at the end of combat.