Antler Skulkin + Ashnod's Altar + Arcbound Prototype
Antler Skulkin
Ashnod's Altar
Arcbound Prototype
Requires
Antler Skulkin must be on the battlefield.
Ashnod's Altar must be on the battlefield.
Arcbound Prototype must be on the battlefield.
Mana needed: 
Steps
- Activate Antler Skulkin by paying , giving Arcbound Prototype persist until end of turn.
- Activate Ashnod's Altar by sacrificing Arcbound Prototype, adding .
- When Arcbound Prototype dies, its modular and persist abilities trigger.
- Resolve the modular trigger, putting all +1/+1 counters on Arcbound Prototype onto another artifact creature you control.
- Resolve the persist trigger, returning Arcbound Prototype from your graveyard to the battlefield with one +1/+1 counter on it due to its modular ability.
- Repeat.
Results
Infinite +1/+1 counters on each artifact creature you control except Arcbound Prototype. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.
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Creatures
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Instants
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Mana Artifacts
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100% of 1 decks
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60% of 5 decks
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Jack-o'-Lantern
40% of 5 decks
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Honored Heirloom
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Marble Diamond
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+38% synergy
Commander's Sphere
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Mind Stone
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+22% synergy
Fellwar Stone
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+19% synergy
Fire Diamond
33% of 3 decks
+31% synergy
Boros Signet
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+28% synergy
Letter of Acceptance
20% of 5 decks
+20% synergy
Liquimetal Torque
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+16% synergy
Thought Vessel
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+4% synergy
Lands
Lorehold Campus
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+66% synergy
Wind-Scarred Crag
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+65% synergy
Boros Garrison
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+63% synergy
Terramorphic Expanse
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Command Tower
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Evolving Wilds
40% of 5 decks
+19% synergy
Alpine Meadow
33% of 3 decks
+33% synergy
Sacred Peaks
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Boros Guildgate
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Thriving Bluff
33% of 3 decks
+32% synergy
Rustvale Bridge
33% of 3 decks
+32% synergy
Demolition Field
25% of 4 decks
+22% synergy
Myriad Landscape
20% of 5 decks
-0% synergy
Exotic Orchard
20% of 5 decks
-15% synergy