Kumena, Tyrant of Orzaca

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→∞ mana

+ mana rocks producing 2+

Dramatic Reversal + Isochron Scepter (+ mana rocks producing 2+) → infinite mana and infinite untaps

1. 1Imprint a 2-or-less instant (ideally a mana-producing one, or use with rocks totaling 2+) — cast Isochron Scepter imprinting Dramatic Reversal
2. 2Have nonland mana sources on board producing 3+ total (Sol Ring, Talisman, Signet, dorks)
3. 3Activate Isochron Scepter to cast Dramatic Reversal, untapping all nonland permanents
4. 4Tap the untapped rocks for more mana than the activation cost, netting mana each loop
5. 5Repeat for infinite mana, then dump it into Kumena, Tyrant of Orazca's draw ability to draw your deck
6. 6Win with Thassa's Oracle

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→∞ loop

Wanderwine Prophets + Deeproot Pilgrimage → infinite turns

1. 1Have Deeproot Pilgrimage in play
2. 2Cast/attack with Wanderwine Prophets and connect (or champion a Merfolk) to trigger its clash-for-extra-turn ability
3. 3Deeproot Pilgrimage makes Merfolk tokens as you cast/tap Merfolk, refueling the champion requirement
4. 4Take repeated extra turns, attacking each turn to reset the loop
5. 5Continue for infinite turns

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→∞ loop

Intruder Alarm + Deeproot Pilgrimage → infinite Merfolk tokens and untaps

1. 1Have Deeproot Pilgrimage and Intruder Alarm in play
2. 2Cast a Merfolk spell — Deeproot Pilgrimage triggers, making a 1/1 Merfolk token
3. 3The token's ETB triggers Intruder Alarm, untapping all your creatures
4. 4Tap creatures to a Merfolk-tapping effect (Kumena, Cryptolith Rite) to cast/produce again — loop makes infinite tokens and untaps

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→∞ loop

Kumena, Tyrant of Orazca + Deeproot Pilgrimage + Intruder Alarm → infinite card draw, tokens, and +1/+1 counters

1. 1Have Deeproot Pilgrimage, Intruder Alarm, and Kumena, Tyrant of Orazca in play
2. 2Tap Merfolk to Kumena's ETB-generating loop; each Merfolk token entering triggers Intruder Alarm to untap everything
3. 3Tap three untapped Merfolk to Kumena to draw a card, then repeat
4. 4Each loop nets a token (via Deeproot Pilgrimage), a draw, and lets you tap five for team counters
5. 5Repeat for infinite draw, infinite tokens, and infinite +1/+1 counters, then win

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→value engine

soft lock

Lullmage Mentor + Intruder Alarm → counter every opponent spell (soft lock)

1. 1Have Intruder Alarm in play
2. 2Cast Lullmage Mentor — it makes a Merfolk token when you tap Merfolk to counter
3. 3When an opponent casts a spell, tap Merfolk to Lullmage Mentor to counter it; the resulting token ETB triggers Intruder Alarm, untapping your Merfolk
4. 4Repeat each opposing spell — you have untapped Merfolk available to counter everything they cast

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→∞ loop

Deeproot Pilgrimage + Kiora's Follower + Forensic Researcher → infinite Merfolk tokens

1. 1Have Deeproot Pilgrimage and Forensic Researcher in play with Kiora's Follower
2. 2Cast a Merfolk — Deeproot Pilgrimage makes a token
3. 3Use Forensic Researcher's tap ability, then untap it with Kiora's Follower
4. 4Loop the untap to keep generating token triggers for infinite Merfolk tokens

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→∞ loop

The Watcher in the Water + Kindred Discovery → infinite/near-infinite card draw and tokens

1. 1Have Kindred Discovery in play naming Merfolk (or Kraken)
2. 2Cast/ETB The Watcher in the Water, whose triggers make tokens/draw off Merfolk entering
3. 3Each Merfolk entering draws a card off Kindred Discovery, chaining more creatures and triggers
4. 4Loop for near-infinite draw and tokens, then win with Thassa's Oracle

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→∞ mana

Mutavault + Deeproot Pilgrimage + Intruder Alarm → infinite colorless mana and tokens

1. 1Have Deeproot Pilgrimage and Intruder Alarm in play with Mutavault
2. 2Activate Mutavault to make it a Merfolk creature
3. 3A Merfolk token entering (from Pilgrimage) triggers Intruder Alarm, untapping Mutavault
4. 4Tap Mutavault for colorless, animate/loop to generate tokens and mana infinitely