Ring of Peace

At the beginning of your upkeep, put a faction
counter on Ring of Peace.
{t}: Add {u}{r} to your mana pool. Roll a d20 for
each faction counter on Ring of Peace:
1-12: Create a 2/2 blue and red artifact soldier creature token with hexproof.
13-18: Put a hexproof token on target artifact or creature you control.
19-20: Return an artifact from you graveyard to
the battlefield, tapped.