Lurking Roper + Elemental Mastery + Soul's Attendant

Lurking Roper
Elemental Mastery
Soul's Attendant

Requires
Lurking Roper must be on the battlefield. Elemental Mastery must be on the battlefield. Soul's Attendant must be on the battlefield. Lurking Roper does not have summoning sickness. Elemental Mastery attached to Lurking Roper.
Steps
  1. Activate Lurking Roper by tapping it, creating four 1/1 Elemental creature tokens.
  2. When the Elementals enter the battlefield, they trigger Soul's Attendant four times.
  3. Resolve the first Soul's Attendant trigger, causing you to gain one life.
  4. Lurking Roper triggers, untapping itself.
  5. Repeat.
Results
Infinite creature tokens with haste. Infinite ETB. Infinite lifegain. Infinite lifegain triggers.

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Creatures
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25% of 4 decks +24% synergy
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25% of 4 decks +25% synergy
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25% of 4 decks +20% synergy
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20% of 5 decks +20% synergy
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20% of 5 decks +20% synergy
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20% of 5 decks +20% synergy
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20% of 5 decks +20% synergy
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Wooded Foothills
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Arid Mesa
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Spire Garden
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Evolving Wilds
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Bountiful Promenade
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Clifftop Retreat
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Rugged Highlands
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Rugged Prairie
20% of 5 decks +14% synergy
Blossoming Sands
20% of 5 decks +13% synergy
Naya Panorama
20% of 5 decks +12% synergy
City of Brass
20% of 5 decks +12% synergy
Temple of Abandon
20% of 5 decks +7% synergy
Boros Garrison
20% of 5 decks +6% synergy
Temple of Plenty
20% of 5 decks +6% synergy
Krosan Verge
20% of 5 decks +5% synergy
Gruul Turf
20% of 5 decks +5% synergy
Selesnya Sanctuary
20% of 5 decks +5% synergy
Brushland
20% of 5 decks +4% synergy
Karplusan Forest
20% of 5 decks +4% synergy
Fortified Village
20% of 5 decks +1% synergy
Terramorphic Expanse
20% of 5 decks -3% synergy
Spectator Seating
20% of 5 decks -8% synergy
Sunpetal Grove
20% of 5 decks -12% synergy
Rootbound Crag
20% of 5 decks -12% synergy
Path of Ancestry
20% of 5 decks -14% synergy