All 169 Combos with Echoing Deeps

Lotus Field + Echoing Deeps + Aftermath Analyst + Shifting Woodland + Spelunking

Infinite Mana: Infinite colored mana, Infinite mana lands you control can produce, Infinite landfall triggers, Infinite card draw, Infinite draw triggers

Play Lotus Field. When it enters untapped due to Spelunking, it triggers. Holding priority, activate Lotus Field by tapping it, adding {G}{G}{G}. Resolve the Lotus Field trigger, sacrificing it and Echoing Deeps. Activate Aftermath Analyst by paying {3}{G} and sacrificing it, returning all land cards from your graveyard to the battlefield untapped due to Spelunking. Choose to have Echoing Deeps enter as a copy of Lotus Field. When Echoing Deeps and Lotus Field enter, they each trigger. Holding priority, activate Echoing Deeps, Lotus Field and two other mana-producing lands except Shifting Woodland by tapping them, adding at least {5}{G}{G}{G}. Resolve the Echoing Deeps and Lotus Field triggers, sacrificing them and the lands tapped for mana in step 6. Activate Shifting Woodland's first ability by tapping it, adding {G}. Activate Shifting Woodland's second ability by paying {2}{G}{G}, causing it to become a copy of Aftermath Analyst. Activate Shifting Woodland by paying {3}{G} and sacrificing it, returning all land cards from your graveyard to the battlefield untapped due to Spelunking. Choose to have Echoing Deeps enter as a copy of Lotus Field. Repeat from step 5.