Derevi, Empyrial Tactician | Bloom Tender | Roaming Throne

(and one other card)

Cards That Copy or Clone Creatures

Derevi in the command zone.
All other permanents on the battlefield (
Roaming Throne with "Bird" or "Wizard" chosen).
Derevi must be your commander.

Activate
Bloom Tender by tapping it, adding at least ({G} magic symbol) ({W} magic symbol) ({U} magic symbol) .
Activate
Derevi by paying ({1} magic symbol) ({G} magic symbol) ({W} magic symbol) ({U} magic symbol) , putting it onto the battlefield from the command zone.
Put
Derevi into your graveyard due to the legend rule, and then choose to return
Derevi to the command zone.
Derevi's enters-the-battlefield ability triggers twice due to
Roaming Throne.
Resolve the first trigger, untapping
Bloom Tender.
Holding priority, activate
Bloom Tender by tapping it, adding at least ({G} magic symbol) ({W} magic symbol) ({U} magic symbol) .
Resolve the second
Derevi trigger, untapping
Bloom Tender.
Repeat.

Once you have infinite mana, you may untap any permanent(s) using
Derevi's trigger. The card you use to clone / copy
Derevi must not bypass the legend rule. The copy must be legendary and have
Derevi's name for the legend rule to take effect appropriately.