Vault of the Warrior

Vault of the Warrior enters the battlefield with
10 unlock counters on it, and at the start of
your end step, you may remove one of these
counters. When no counters remain,
the vault has opened, create 1 Eridian
Thunderstorm and 1 Eridian Murcurail, then,
transform Vault of the Warrior into Eridian Superweapon.
{t}, add one mana of your commanders colours