Activate Marvin using Transdimensional Bovine's ability by tapping it, adding {U}{U}.
Activate Marvin using Horseshoe Crab's ability by paying {U}, untapping it.
Repeat.

Infinite colored mana

Marvin, Murderous Mimic

Horseshoe Crab

Transdimensional Bovine

Activate Marvin using Transdimensional Bovine's ability by tapping it, adding {2}.
Activate Marvin using Pili-Pala's ability by paying {2} and untapping it, adding one mana of any color.
Repeat.

Pili-Pala

Activate Marvin using Transdimensional Bovine's ability by tapping it, adding {2}
Activate Marvin using Farmstead Gleaner's ability by paying {2} and untapping it, putting a +1/+1 counter on Marvin.
Repeat.

Infinite +1/+1 counters on a creature

Farmstead Gleaner

Activate Lightning Greaves' equip ability by paying {0}, targeting Transdimensional Bovine.
Monk Gyatso triggers. Choose not to airbend Transdimensional Bovine.
Resolve Lightning Greaves' ability, attaching it to Transdimensional Bovine.
Activate Transdimensional Bovine by tapping it, adding {2}.
Activate Lightning Greaves' equip ability by paying {0}, attaching it to Monk Gyatso.
Activate Lightning Greaves' equip ability by paying {0}, targeting Transdimensional Bovine.
Monk Gyatso triggers, airbending Transdimensional Bovine.
The Lightning Greaves ability fizzles due to no longer having a legal target.
Cast Transdimensional Bovine from exile by paying {2}.
Repeat.

Infinite ETB

Infinite LTB

Infinite storm count

Monk Gyatso

Lightning Greaves

Cast Touch of Vitae by paying {2}{G}, targeting Transdimensional Bovine.
Activate Quicksilver Elemental by paying {U}, causing it to gain Transdimensional Bovine's activated abilities until end of turn.
Activate Quicksilver Elemental using Transdimensional Bovine's ability by tapping it, adding {U}{U}.
Activate Quicksilver Elemental using Transdimensional Bovine's ability granted to it by Touch of Vitae by paying {0}, untapping Quicksilver Elemental.
Repeat from step 2.

Quicksilver Elemental

Touch of Vitae

Activate Karn by paying {1}, causing Halo Fountain to become a creature.
Activate Transdimensional Bovine by tapping it, adding {W}{W}.
Activate Halo Fountain's second ability by paying {W}{W}, tapping it, and then untapping it and Transdimensional Bovine, causing you to draw a card.
Repeat from step 2.

Infinite card draw

Infinite draw triggers

Near-infinite creature tokens

Near-infinite mana creatures you control can produce

Near-infinite untap of creatures you control

Halo Fountain

Karn, Silver Golem

Activate Transdimensional Bovine by tapping it, adding two mana of any color.
Activate Sword of the Paruns by paying {1}, untapping Transdimensional Bovine
Repeat.

Infinite mana creatures you control can produce

Infinite untap of creatures you control

Sword of the Paruns

Power Artifact

Activate Transdimensional Bovine by tapping it, adding {G}{G}.
Cast Wirewood Symbiote by paying {G}.
Activate Mirror Entity by paying {1}, giving creatures you control all creature types and base power and toughness 1/1 until end of turn.
Activate Wirewood Symbiote by returning it from the battlefield to your hand, untapping Transdimensional Bovine.
Repeat.

Wirewood Symbiote

Mirror Entity

Activate Rex using Transdimensional Bovine's ability by tapping it, adding {2}
Activate Rex using Pili-Pala's ability by paying {2} and untapping it, adding one mana of any color.
Repeat.

Combos with "Transdimensional Bovine"