Timestream Navigator by tapping it, paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) , and putting it on the bottom of your library, taking an extra turn after this one.
Pass the turn.
Repeat.
Results
Infinite turns.
Metadata
This combo produces a lock.
In 785 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Ruthless (Bracket 4+).