Lathliss, Dragon Queen + Universal Automaton + Cloudstone Curio + Mana Echoes
Lathliss, Dragon Queen
Universal Automaton
Cloudstone Curio
Mana Echoes
Requires
Lathliss, Dragon Queen must be on the battlefield.
Universal Automaton must be in hand.
Cloudstone Curio must be on the battlefield.
Mana Echoes must be on the battlefield.
Mana needed: 
Steps
- Cast Universal Automaton by paying .
- Universal Automaton enters the battlefield, triggering Mana Echoes and Lathliss.
- Resolve the Mana Echoes trigger, adding for each creature you control.
- Resolve the Lathliss trigger, creating a 5/5 Dragon creature token.
- The Dragon enters the battlefield, triggering Cloudstone Curio and Mana Echoes.
- Resolve the Cloudstone Curio trigger, returning Universal Automaton from the battlefield to your hand.
- Resolve the Mana Echoes trigger, adding for each Dragon you control.
- Repeat.
Results
Infinite colorless mana. Infinite creature tokens. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers. Infinite storm count.
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Lands
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82% of 38 decks
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Smoldering Marsh
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66% of 38 decks
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58% of 38 decks
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Rakdos Carnarium
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Graven Cairns
29% of 38 decks
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Cavern of Souls
27% of 41 decks
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Myriad Landscape
27% of 41 decks
+7% synergy
Temple of Malice
26% of 38 decks
+12% synergy
Mount Doom
19% of 27 decks
+11% synergy
Shadowblood Ridge
18% of 38 decks
+7% synergy
Haven of the Spirit Dragon
17% of 41 decks
+16% synergy
Exotic Orchard
17% of 41 decks
-18% synergy
Canyon Slough
16% of 38 decks
+10% synergy
Temple of the Dragon Queen
12% of 41 decks
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Blackcleave Cliffs
11% of 38 decks
+5% synergy
Prismatic Vista
10% of 41 decks
+4% synergy
Geothermal Bog
8% of 38 decks
+4% synergy
Unclaimed Territory
7% of 41 decks
+2% synergy
Terramorphic Expanse
7% of 41 decks
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Evolving Wilds
7% of 41 decks
-14% synergy