Fall of the Thran, Evolution Sage, Retreat to Coralhelm, Xavier Sal, Infested Captain, and Trenching Steed

Prerequisites

• Fall of the Thran on the battlefield
• Evolution Sage on the battlefield
• Retreat to Coralhelm on the battlefield
• Xavier Sal, Infested Captain on the battlefield
• Trenching Steed on the battlefield
• You control at least one land
• Xavier Sal does not have summoning sickness
• Fall of the Thran has exactly one or two lore counters on it

Steps

1. At the beginning of your precombat main phase, Fall of the Thran triggers, putting a lore counter on it
2. Fall of the Thran's second or third chapter ability triggers
3. Holding priority, activate Trenching Steed by sacrificing a land, giving it +0/+3 until end of turn
4. You may optionally repeat step 3 one additional time
5. If Fall of the Thran has three loyalty counters on it, activate Xavier Sal's first ability by tapping it and removing a lore counter from Fall of the Thran, causing you to populate
6. Resolve the Fall of the Thran chapter trigger from step 2, causing each player to return two land cards from your graveyard to the battlefield
7. Whenever the land(s) enter the battlefield, Evolution Sage and Retreat to Coralhelm trigger for each land that entered the battlefield under your control
8. Holding priority, if the land(s) enter the battlefield untapped, you may activate them by tapping them, adding at least
9. Resolve the first Retreat to Coralhelm trigger, untapping Xavier Sal
10. Resolve the second Retreat to Coralhelm trigger, if applicable, either causing you to scry 1 or to tap or untap target creature
11. Resolve the first Evolution Sage trigger, putting a lore counter on Fall of the Thran
12. Repeat from step 2
13. If applicable, resolve all remaining Evolution Sage triggers, causing you to proliferate that many times
14. If you sacrifice and return two lands each cycle, this combo will net infinite untap of creatures you control and infinite scry 1

Results

• Infinite copies of creature tokens you control
• Infinite creature tokens
• Infinite ETB
• Infinite landfall triggers
• Infinite mana creatures you control can produce
• Infinite mana lands you control that enter the battlefield untapped can produce
• Infinite proliferate
• Infinite scry 1
• Infinite untap of creatures you control
• Return all land cards from all graveyards to the battlefield under their owner's control