Activate the mana-producing creature by tapping it, adding three times the usual amount of mana due to
Nyxbloom Ancient.
Activate
Temur Sabertooth by paying ({1} magic symbol) ({G} magic symbol) , returning the mana-producing creature from the battlefield to your hand and giving
Temur Sabertooth indestructible until end of turn.
Cast the mana-producing creature by paying its mana cost.
Repeat any number of times.
If the loop produces infinite mana (see Notes), you can then spend that mana to activate
Temur Sabertooth any number of times, returning and recasting any creatures you control whose costs can be paid for by the type of mana you have.
Notes
A mana dork that costs one to play and taps to add one (before modifiers) will break even, allowing you to perform this infinite loop without the infinite mana or infinite blinking results. Most mana dorks that tap for more than one mana will provide those additional results.
Results
Infinite blinking of most creatures.
Infinite creature ETB.
Infinite creature LTB.
Infinite mana creatures you control can produce.
Infinite storm count.
Metadata
In 6850 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).