Vadrik, Astral Archmage | Mystic Retrieval | Runic Repetition

(and one other card)

Vadrik has power 3 or greater.
Lands you control can tap to produce at least ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({R} magic symbol) .

Activate all mana-producing lands you control by tapping them, adding at least ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({R} magic symbol) .
Cast
Turnabout by paying ({U} magic symbol) ({U} magic symbol) , untapping all lands you control.
Cast
Mystic Retrieval by paying ({U} magic symbol) , returning
Turnabout from your graveyard to your hand.
Cast
Mystic Retrieval from your graveyard for its flashback cost by paying ({R} magic symbol) , returning
Runic Repetition from your graveyard to your hand and exiling
Mystic Retrieval.
Cast
Runic Repetition by paying ({U} magic symbol) , returning
Mystic Retrieval from exile to your hand.
Repeat.
If lands you control can tap to produce at least ({1} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({R} magic symbol) , this combo nets infinite mana.