Activate Marwyn by tapping it, adding at least seven {G}.
Cast Mobilize by paying {G}, untapping all creatures you control.
Activate Temur Sabertooth by paying {1}{G}, returning Eternal Witness from the battlefield to your hand.
Cast Eternal Witness by paying {1}{G}{G}.
Eternal Witness enters the battlefield, returning Mobilize from your graveyard to your hand.
Repeat.

Infinite blinking of some creatures

Infinite creature ETB

Infinite green mana

Infinite creature LTB

Infinite magecraft triggers

Infinite mana creatures you control can produce

Infinite storm count

Infinite untap of creatures you control

Marwyn, the Nurturer

Eternal Witness

Temur Sabertooth

Mobilize

Cast Mobilize.
Tap your creatures for {3}{G}{G}{G}{G}.
Spend {1}{G} to return Eternal Witness.
Cast Eternal Witness for {1}{G}{G}, returning Mobilize.
Repeat.

Infinite colored mana

Infinite colorless mana

Kogla, the Titan Ape

Cast Mobilize by paying {G}.
Kitsa's prowess ability triggers, giving it +1/+1 until end of turn.
Holding priority, activate any number of creatures by tapping them, adding at least {2}.
Activate Kitsa's second ability by paying {2} and tapping it, copying Mobilize.
Resolve the copy of Mobilize, untapping all creatures you control.
Repeat from step 3.

Kitsa, Otterball Elite

Activate Marwyn by tapping it, adding at least eight {G}.
Cast Mobilize by paying {G}, untapping all creatures you control.
Activate Temur Sabertooth by paying {1}{G}, returning Timeless Witness from the battlefield to your hand.
Cast Timeless Witness by paying {2}{G}{G}.
Timeless Witness enters the battlefield, returning Mobilize from your graveyard to your hand.
Repeat.

Timeless Witness

Activate all mana-producing creatures you control by tapping them, adding at least {G}.
Activate Charnelhoard Wurm by tapping it, dealing damage equal to its power to an opponent.
Charnelhoard Wurm triggers, returning Mobilize to your hand from your graveyard.
Cast Mobilize by paying {G}, untapping all creatures you control.
Repeat.
If creatures you control can tap to produce at least {1}{G}, this combo nets infinite mana.

Infinite damage

Charnelhoard Wurm

Burning Anger

Activate all mana-producing creatures you control by tapping them, adding at least {G}.
Activate Charnelhoard Wurm by tapping it, dealing 2 damage to an opponent.
Charnelhoard Wurm triggers, returning Mobilize to your hand from your graveyard.
Cast Mobilize by paying {G}, untapping all creatures you control.
Repeat.
If creatures you control can tap to produce at least {1}{G}, this combo will net infinite mana.

Heavy Arbalest

Activate all mana-producing creatures you control by tapping them, adding at least {G}.
Activate Charnelhoard Wurm by tapping it, dealing 1 damage to an opponent.
Charnelhoard Wurm triggers, returning Mobilize to your hand from your graveyard.
Cast Mobilize by paying {G}, untapping all creatures you control.
Repeat.
If creatures you control can tap to produce at least {1}{G}, this combo will net infinite mana.

Combos with "Mobilize"