Glaurung, Father of Dragons

Trample, haste
Whenever Glaurung deals combat damage to a
player, create a colorless Gold artifact token with
"{t}, Sacrifice this artifact: Add one mana of any
color to your mana pool."
{1}{r}, Sacrifice an artifact: Glaurung gets +X/+0
and gains indestructible until end of turn, where
X is the number of artifacts you control.