Declare Wanderwine Prophets as an attacker.
Deeproot Pilgrimage triggers, creating a 1/1 Merfolk creature token.
Deal combat damage to an opponent using Wanderwine Prophets.
Wanderwine Prophets triggers, causing you to sacrifice the Merfolk token and take an extra turn after this one.
Repeat each turn.

Infinite turns

Wanderwine Prophets

Deeproot Pilgrimage

Cast Wanderwine Prophets by paying {4}{U}{U}.
Wanderwine Prophets enters the battlefield, triggering Inalla and Wanderwine Prophets.
Resolve Inalla's trigger, causing you to pay {1} to create a token copy of Wanderwine Prophets.
Token copy of Wanderwine Prophets enters the battlefield, championing original Wanderwine Prophets.
Resolve the Wanderwine Prophets trigger, does nothing.
Move to combat.
Declare token copy of Wanderwine Prophets as attacker.
Deal combat damage with Wanderwine Prophets.
Token copy of Wanderwine Prophets triggers, causing you to sacrifice itself and take an extra turn after this one.
Token copy of Wanderwine Prophets leaves the battlefield, returning Wanderwine Prophets to the battlefield from exile.
Repeat step 2 to 5.
Move to your next turn.
Repeat from step 6.

Infinite combat damage to opponents

Inalla, Archmage Ritualist

Attack with Wanderwine Prophets and Stonybrook Schoolmaster.
Stonybrook Schoolmaster triggers, creating a 1/1 Merfolk Wizard token.
Wanderwine Prophets deals combat damage, sacrificing the Merfolk token.
You get an extra turn.
Pass the turn.
Repeat.

Stonybrook Schoolmaster

Cast Wanderwine Prophets by paying {4}{U}{U}.
Wanderwine Prophets's Champion a Merfolk ability and Molten Echoes's ability trigger.
Resolve Molten Echoes's ability, creating a token copy of Wanderwine Prophets with haste.
The token Wanderwine Prophets triggers, exiling the original Wanderwine Prophets until the token leaves the battlefield.
Resolve the remaining Champion a Merfolk ability, declining to exile anything.
Deal combat damage to an opponent with the token Wanderwine Prophets.
The token Wanderwine Prophets triggers, allowing you to sacrifice it to take an extra turn.
The token's Champion a Merfolk ability returns the original Wanderwine Prophets from exile to the battlefield.
Repeat steps 2 through 5 one additional time.
At the beginning of your end step, exile the new token copy of Wanderwine Prophets.
The token's Champion a Merfolk ability returns the original Wanderwine Prophets from exile to the battlefield.
Repeat steps 2 through 5 one additional time.
Repeat from step 6 each turn.

Infinite LTB

Infinite ETB

Molten Echoes

Activate Maskwood Nexus by paying {3} and tapping it, creating a 2/2 Shapeshifter creature token with changeling.
Deal combat damage with Wanderwine Prophets.
Wanderwine Prophets triggers, causing you to sacrifice the Changeling token and take an extra turn after this one.
Repeat each turn.

Maskwood Nexus

At the beginning of your upkeep, create a token copy of the merfolk enchanted with Followed Footsteps.
Attack with Wanderwine Prophets.
Wanderwine Prophets deals combat damage, sacrificing the token copy of the merfolk.
You get an extra turn.
Pass the turn.
Repeat.

Followed Footsteps

Deal combat damage to an opponent using Wanderwine Prophets.
Wanderwine Prophets triggers, sacrificing itself and causing you to take an extra turn after this one.
When Wanderwine Prophets dies, it triggers, returning all cards exiled with it to the battlefield.
Cast Wanderwine Prophets from your graveyard for its retrace cost by paying {4}{U}{U} and discarding a land card.
When Wanderwine Prophets enters the battlefield, it triggers, exiling another Merfolk you control.
Move to your next turn.
During your draw step, choose to reveal cards from the top of your library until you reveal a land card and put it into your hand.
Repeat.

Near-infinite turns

Deeproot Historian

Abundance

Deal combat damage to an opponent using Wanderwine Prophets.
Wanderwine Prophets triggers, causing you to sacrifice a Merfolk to take an extra turn after this one.
At the beggining of the end step, Thassa triggers, blinking Benthicore.
Benthicore enters the battlefield, creating two 1/1 Merfolk Wizard creature tokens.
Repeat.

Thassa, Deep-Dwelling

Benthicore

Deal combat damage to an opponent using Wanderwine Prophets.
Wanderwine Prophets triggers, causing you to sacrifice a Merfolk to take an extra turn after this one.
At the beggining of the end step, Conjurer's Closet triggers, blinking Benthicore.
Benthicore enters the battlefield, creating two 1/1 Merfolk Wizard creature tokens.
Repeat.

Conjurer's Closet

Deal combat damage to an opponent using Wanderwine Prophets.
Wanderwine Prophets triggers, causing you to sacrifice a Merfolk to take an extra turn after this one.
At the beggining of the end step, Soulherder's second ability triggers, blinking Benthicore.
Soulherder's first ability triggers, putting a +1/+1 counter on it.
Benthicore enters the battlefield, creating two 1/1 Merfolk Wizard creature tokens.
Repeat.

Soulherder

Deal combat damage to an opponent using Wanderwine Prophets.
Wanderwine Prophets triggers, causing you to sacrifice a Merfolk to take an extra turn after this one.
At the beggining of the end step, Teleportation Circle triggers, blinking Benthicore.
Benthicore enters the battlefield, creating two 1/1 Merfolk Wizard creature tokens.
Repeat.

Combos with "Wanderwine Prophets"