Lands you control can tap to produce at least ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({R} magic symbol) .
Steps
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.
Results
Infinite magecraft triggers.
Infinite mana permanents you control can produce.
Infinite storm count.
Metadata
In 47 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).