Activate a creature using Grist's first loyalty ability by putting a loyalty counter on it, causing you to create a 1/1 Insect creature token and mill a card, and then put a loyalty counter on the creature and repeat the process if the card was an Insect.
When the Insect enters, Warden of the Grove triggers, putting a +1/+1 counter on the Insect. This causes it to gain Grist's abilities due to Agatha's Soul Cauldron.
Repeat from step 1 using the Insect token instead.

Infinite ETB

Infinite self-mill

Infinite creature tokens

Agatha's Soul Cauldron

Grist, the Hunger Tide

Warden of the Grove

Activate Ashnod's Altar by sacrificing a nontoken creature, adding {C}{C}.
The creature dies, triggering Yedora, returning the creature from your graveyard to the battlefield face down as a Forest land.
The face-down Forest enters the battlefield, triggering Tatyova, causing the Forest to become a 3/3 Elemental with haste until end of turn.
Activate the Forest by tapping it, adding {G}.
Repeat.

Infinite colorless mana

Infinite death triggers

Infinite green mana

Infinite landfall triggers

Infinite LTB

Infinite sacrifice triggers

Tatyova, Steward of Tides

Yedora, Grave Gardener

Ashnod's Altar

Activate Altar of Dementia by sacrificing a nontoken creature.
The creature dies, triggering Yedora, returning the creature from your graveyard to the battlefield face down as a Forest land.
The face-down Forest enters the battlefield, triggering Tatyova, causing the Forest to become a 3/3 Elemental with haste until end of turn.
Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to the sacrificed creature's power.
Activate the Forest by tapping it, adding {G}.
Repeat.

Infinite mill

Altar of Dementia

Activate Phyrexian Altar by sacrificing a nontoken creature, adding one mana of any color.
The creature dies, triggering Yedora, returning the creature from your graveyard to the battlefield face down as a Forest land.
The face-down Forest enters the battlefield, triggering Tatyova, causing the Forest to become a 3/3 Elemental with haste until end of turn.
Repeat.

Infinite colored mana

Phyrexian Altar

Cast Invasion of Arcavios by paying {3}{U}{U}.
Tidespout Tyrant triggers, returning a permanent to its owner's hand.
When Invasion of Arcavios enters the battlefield, it triggers, returning Time Warp from your graveyard to your hand, or searching your library for Time Warp and putting it into your hand, if needed.
Cast Time Warp by paying {3}{U}{U}.
Tidespout Tyrant triggers, returning Invasion of Arcavios to your hand from the battlefield.
Resolve Time Warp, causing you to take an extra turn after this one.
Repeat each turn.

Infinite turns

Invasion of Arcavios // Invocation of the Founders

Tidespout Tyrant

Time Warp

Cast Awakened Awareness for X=4 by paying {4}{U}{U}.
Sage of Hours triggers, putting a +1/+1 counter on itself.
Awakened Awareness enters the battlefield, putting four +1/+1 counters on Sage of Hours.
Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take at least one extra turn after this one.
At the beginning of your next extra turn's upkeep, Riptide Chimera triggers, causing you to return Awakened Awareness from the battlefield to your hand.
Repeat.

Sage of Hours

Riptide Chimera

Awakened Awareness

Cast Time Warp from your graveyard by paying its mana cost.
Tidespout Tyrant triggers, returning Hades from the battlefield to your hand.
Resolve Time Warp, causing you to take an extra turn after this one.
Cast Emet-Selch by paying {1}{U}{B}.
When Emet-Selch enters the battlefield, it triggers, causing you to loot.
At the beginning of your upkeep during your extra turn, Emet-Selch triggers, transforming itself into Hades.
Repeat.

Emet-Selch, Unsundered // Hades, Sorcerer of Eld

Cast High Tide by paying {U}.
Cast Relm's Sketching by paying its mana cost, targeting an Island you control.
Swarm Intelligence triggers. 
Holding priority, activate Gogo by paying {2} and tapping it, copying the Swarm Intelligence ability.
Resolve the copy of Swarm Intelligence's ability, copying the Relm's Sketching spell, targeting an Island you control that enters the battlefield untapped.
Resolve the copy of Relm's Sketching, creating a token copy of the targeted Island.
When the Island token enters, Retreat to Coralhelm triggers, untapping Gogo.
Activate the Island token by tapping it, adding {U}.
High Tide triggers, adding {U}.
Repeat from step 4.

Infinite magecraft triggers

Infinite tapped Island tokens

Gogo, Master of Mimicry

High Tide

Retreat to Coralhelm

Relm's Sketching

Swarm Intelligence

Activate Selvala by paying {G} and tapping it, adding at least {1}{G}{G}{G} plus enough mana to cast a creature card from your hand.
Cast a creature card by paying its mana cost.
Tidespout Tyrant triggers, returning Selvala from the battlefield to your hand.
Cast Selvala by paying {1}{G}{G}.
Tidespout Tyrant triggers, returning the creature cast in step 2 from the battlefield to your hand.
Repeat.

Infinite storm count

Selvala, Heart of the Wilds

Kratos, God of War

Activate Marina by tapping it, unlocking Mirror Room.
Mirror Room triggers twice due to Fractured Realm, creating two token copies of Tidewater Minion.
Activate one of the Tidewater Minion tokens by tapping it, untapping Marina.
Activate Marina by tapping it, locking Mirror Room.
Activate the other Tidewater Minion token by tapping it, untapping Marina.
Repeat.

Infinite tapped creature tokens

Marina Vendrell

Mirror Room // Fractured Realm

Tidewater Minion

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