Cast Astral Dragon by paying {6}{U}{U}.
When Astral Dragon enters the battlefield, it and Bramble Sovereign trigger.
Resolve the Astral Dragon trigger, creating four token copies of Parallel Lives that are 3/3 Dragon creatures in addition to their other types.
Resolve the Bramble Sovereign trigger, causing you to pay {1}{G} to create a total of 32 Astral Dragon tokens.
When the Astral Dragon tokens enter the battlefield, they trigger, creating an extremely large number of Parallel Lives tokens that are 3/3 Dragon creatures in addition to their other types.

Near-infinite creature tokens

Near-infinite ETB

Astral Dragon

Bramble Sovereign

Parallel Lives

Cast Baru and make a token of it with Bramble Sovereign, sacrifice the original.
Play power 5 creature to return Baru to hand with Paleoloth.
Discard Baru to the Baru token making a worm and returning Baru to hand.


Infinite creature tokens

Infinite discard triggers

Infinite ETB

Paleoloth

Baru, Fist of Krosa

Cast Combat Celebrant by paying {2}{R}.
Combat Celebrant enters the battlefield, triggering Bramble Sovereign, causing you to pay {1}{G} to create a token copy of Combat Celebrant.
Proceed to your combat phase, and declare Ghired and Combat Celebrant as attackers.
Ghired triggers, creating a copy of the Combat Celebrant token.
Exert Combat Celebrant, untapping all other creatures you control and gaining an additional combat phase after this one.
Repeat from step 4.

Infinite combat phases

Infinite creature tokens with haste

Ghired, Conclave Exile

Combat Celebrant

Mass Hysteria

Cast Ugin's Nexus by paying {5}.
When Ugin's Nexus enters the battlefield as a 4/4 Elemental due to Bello, Bramble Sovereign, causing you to pay {1}{G} to create a token copy of Ugin's Nexus.
Put the token Ugin's Nexus into exile due to the legend rule and its replacement effect, causing you to take an extra turn after this one.
Activate Temur Sabertooth by paying {1}{G}, returning Ugin's Nexus from the battlefield to your hand.
Repeat each turn.

Infinite turns

Bello, Bard of the Brambles

Ugin's Nexus

Temur Sabertooth

Cast Ugin's Nexus by paying {5}.
When Ugin's Nexus enters the battlefield as a 4/4 Elemental due to Bello, Bramble Sovereign, causing you to pay {1}{G} to create a token copy of Ugin's Nexus.
Put the token Ugin's Nexus into exile due to the legend rule and its replacement effect, causing you to take an extra turn after this one.
Activate Meticulous Excavation by paying {2}{W}, returning Ugin's Nexus from the battlefield to your hand.
Repeat each turn.

Meticulous Excavation

Combos with "Bramble Sovereign"