Cast Hollow One either from your hand or from your graveyard by paying at most {1}, causing it to enter the battlefield as a copy of Morgue Toad due to Infinite Reflection.
Activate Hollow One by sacrificing it, adding {U}{R}.
If you cast Hollow One from your graveyard, Hollow One is not exiled by Abandoned Sarcophagus due to Infinite Reflection removing Hollow One's cycling ability.
Repeat.

Infinite blue mana

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite red mana

Infinite sacrifice triggers

Infinite storm count

Abandoned Sarcophagus

Infinite Reflection

Morgue Toad

Hollow One

Cast Sandbar Merfolk either from your hand or from your graveyard by paying {U}, causing it to enter the battlefield as a copy of Morgue Toad due to Infinite Reflection.
Activate Sandbar Merfolk by sacrificing it, adding {U}{R}.
If you cast Sandbar Merfolk from your graveyard, Sandbar Merfolk is not exiled by Abandoned Sarcophagus due to Infinite Reflection removing Sandbar Merfolk's cycling ability.
Repeat.

Sandbar Merfolk

Activate Saheeli by paying {U}{R} and tapping it, creating a token copy of Morgue Toad with haste.
Activate the Morgue Toad token by sacrificing it, adding {U}{R}.
When the Morgue Toad token dies, Saheeli triggers, untapping Saheeli.
Repeat.

Infinite mana creatures you control can produce

Infinite untap of creatures you control

Saheeli, the Sun's Brilliance

Thornbite Staff

Activate Kiki-Jiki by tapping it, creating a token copy of Morgue Toad with haste.
Activate the Morgue Toad token by sacrificing it, adding {U}{R}.
When the Morgue Toad token dies, Kiki-Jiki triggers, untapping itself.
Repeat.

Kiki-Jiki, Mirror Breaker

Activate Kiki-Jiki by tapping it, creating a token copy of Morgue Toad with haste.
Activate the Morgue Toad token by sacrificing it, adding {U}{R}.
Activate Pemmin's Aura's first ability by paying {U}, untapping Kiki-Jiki.
Repeat.

Pemmin's Aura

Activate Kiki-Jiki by tapping it, creating a token copy of Morgue Toad with haste.
Activate the Morgue Toad token by sacrificing it, adding {U}{R}.
Activate Freed from the Real's second ability by paying {U}, untapping Kiki-Jiki.
Repeat.

Freed from the Real

Activate Orthion's second ability by paying {6}{R}{R}{R} and tapping it, creating five token copies of Morgue Toad with haste.
Activate the five Morgue Toad tokens by sacrificing them, adding {U}{U}{U}{U}{U}{R}{R}{R}{R}{R}.
When the Morgue Toad tokens die, Orthion triggers, untapping itself.
Repeat.
Once you have infinite mana, you may forego sacrificing the Morgue Toad tokens and/or target any other creature.

Infinite copies of creatures you control with haste

Infinite creature tokens with haste

Orthion, Hero of Lavabrink

Activate Morgue Toad by sacrificing it, adding {U}{R}.
When Morgue Toad dies, Luminous Broodmoth triggers, returning Morgue Toad from your graveyard to the battlefield without a flying counter on it due to Solemnity.
Repeat.

Solemnity

Luminous Broodmoth

Activate a Food using Pippin's first ability by paying {1} and tapping it, creating a Food token.
Activate the Food tapped in step 1 using Morgue Toad's ability by sacrificing it, adding {U}{R}.
Repeat.

Infinite tapped Food tokens

Hazel's Brewmaster

Pippin, Warden of Isengard

Activate Morgue Toad by sacrificing it, adding {U}{R}.
When Morgue Toad dies, Yedora triggers, returning Morgue Toad from your graveyard to the battlefield face-down as a Forest land.
When Morgue Toad enters the battlefield, Zimone triggers.
Holding priority, activate Morgue Toad by tapping it, adding {G}.
Resolve the Zimone trigger, turning Morgue Toad face-up.
Repeat.

Combos with "Morgue Toad"