Cast Skitterbeam Batallion by paying {9}.
Brinelin triggers, returning the other creature with mana value 9 from the battlefield to your hnad.
When Skitterbeam Batallion enters the battlefield, it triggers, creating two token copies of itself.
Cast the other creature with mana value 9 for its emerge cost by paying {0} and sacrificing a Skitterbeam Batallion token.
Brinelin triggers, returning the nontoken Skitterbeam Batallion from the battlefield to your hand.
Cast Skitterbeam Batallion for its emerge cost by paying {0} and sacrificing a Skitterbeam Batallion token.
Repeat from step 2.

Infinite creature LTB

Infinite creature ETB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite storm count

Creature with MV=9 that has a generic mana cost

Brinelin, the Moon Kraken

Herigast, Erupting Nullkite

Skitterbeam Battalion

Cast Skitterbeam Batallion by paying {0}.
Animar triggers, putting a +1/+1 counter on itself.
Skitterbeam Batallion enters the battlefield, creating two token copies of it.
Activate Phyrexian Altar twice by sacrificing the two Skitterbeam Batallion tokens, adding {1}{G}.
Activate Temur Sabertooth by paying {1}{G}, returning Skitterbeam Batallion from the battlefield to your hand.
Repeat.

Infinite +1/+1 counters on a creature

Animar, Soul of Elements

Phyrexian Altar

Temur Sabertooth

Cast Skitterbeam Batallion by paying {0}.
Animar triggers, putting a +1/+1 counter on itself.
Skitterbeam Batallion enters the battlefield, creating two token copies of it.
Activate Phyrexian Altar twice by sacrificing the two Skitterbeam Batallion tokens, adding {1}{U}.
Activate Drafna's first ability by paying {1}{U}, returning Skitterbeam Batallion from the battlefield to your hand.
Repeat.

Drafna, Founder of Lat-Nam

Cast Skitterbeam Batallion by paying {0}.
Skitterbeam Batallion enters the battlefield, creating two token copies of it.
Activate Phyrexian Altar twice by sacrificing the two Skitterbeam Batallion tokens, adding {1}{U}.
Activate Drafna's first ability by paying {1}{U}, returning Skitterbeam Batallion from the battlefield to your hand.
Repeat.

Mycosynth Golem

Cast Skitterbeam Batallion by paying {0}.
Skitterbeam Batallion enters the battlefield, creating two token copies of it.
Activate Phyrexian Altar twice by sacrificing the two Skitterbeam Batallion tokens, adding {1}{G}.
Activate Temur Sabertooth by paying {1}{G}, returning Skitterbeam Batallion from the battlefield to your hand.
Repeat.

Combos with "Skitterbeam Battalion"