Orvar, the All-Form | Ghostly Flicker | Stone-Seeder Hierophant (and one other card)

Cards

You control a land that enters the battlefield untapped and can tap to produce at least ({U} magic symbol) .
Stone-Seeder Hierophant does not have summoning sickness.

Cast
Ghostly Flicker by paying ({2} magic symbol) ({U} magic symbol) , targeting
Archaeomancer and the mana-producing land.
Orvar triggers, creating a copy of the mana-producing land.
When the land token enters the battlefield,
Stone-Seeder Hierophant triggers.
Holding priority, activate the nontoken land by tapping it, adding ({U} magic symbol) .
Activate
Stone-Seeder Hierophant by tapping it, untapping the land.
Activate the nontoken land by tapping it, adding ({U} magic symbol) .
Resolve the
Stone-Seeder Hierophant trigger from step 3, untapping it.
Resolve
Ghostly Flicker, blinking the land and
Archaeomancer.
When the land and
Archaeomancer enter the battlefield,
Archaeomancer and
Stone-Seeder Hierophant trigger.
Resolve the
Archaeomancer trigger, returning
Ghostly Flicker from your graveyard to your hand.
Holding priority, activate the land token by tapping it, adding at least ({U} magic symbol) .
Activate
Stone-Seeder Hierophant by tapping it, untapping the land token.
Resolve the
Stone-Seeder Hierophant trigger from step 8, untapping it.
Repeat from step 2.

Once you have infinite mana, you may cast
Ghostly Flicker targeting any other permanent(s).

This combo has been estimated to be Exhibition (Bracket 1+).