Stone-Seeder Hierophant + Sylvan Safekeeper Combos

2 known combos featuring both cards in Commander

Infinite death triggers Infinite mana lands you control can produce Infinite landfall triggers Infinite LTB Infinite sacrifice triggers

Combo 1 with Shifting Woodland + Aftermath Analyst

Results: Infinite LTB · Infinite sacrifice triggers · Infinite death triggers · Infinite mana lands you control can produce · Infinite landfall triggers
Steps
  1. Activate Sylvan Safekeeper by sacrificing any land except Shifting Woodland.
  2. Repeat step 1 until you control no other lands except Shifting Woodland.
  3. Activate Shifting Woodland's second ability by paying {2}{G}{G}, causing it to become a copy of Aftermath Analyst until end of turn.
  4. Activate Shifting Woodland by paying {3}{G} and sacrificing it, returning it and all other land cards from your graveyard to the battlefield tapped.
  5. When the lands enter the battlefield, Stone-Seeder Hierophant triggers that many times.
  6. Resolve the first trigger, untapping Stone-Seeder Hierophant.
  7. Activate Stone-Seeder Hierophant by tapping it, untapping a land.
  8. Repeat from step 5 for each remaining trigger.
  9. Activate any number of lands by tapping them, adding at least {5}{G}{G}{G}.
  10. Repeat.
  11. Resolve all Sylvan Safekeeper abilities.

Combo 2 with Lumra, Bellow of the Woods + Mirrorpool

Results: Infinite ETB · Infinite death triggers · Infinite self-mill · Infinite mana lands you control can produce · Infinite landfall triggers · Put all land cards from your library and graveyard onto the battlefield
Show steps
  1. Activate any number of other lands by tapping them, adding at least {4}{C}.
  2. Activate Sylvan Safekeeper by sacrificing a land except Mirrorpool.
  3. Repeat step 2 until you control no lands except Mirrorpool.
  4. Activate Mirrorpool's third ability by paying {4}{C}, tapping and sacrificing it, creating a token copy of Lumra.
  5. Put the Lumra token into your graveyard due to the legend rule.
  6. The Lumra token's enters-the-battlefield ability triggers, causing you to mill four cards and return all land cards from your graveyard to the battlefield tapped.
  7. When the lands enter the battlefield, Stone-Seeder Hierophant triggers that many times.
  8. Resolve the first trigger, untapping Stone-Seeder Hierophant.
  9. Holding priority, activate Stone-Seeder Hierophant by tapping it, untapping a land.
  10. Repeat from step 8 for the remaining triggers.
  11. Repeat from step 1.
  12. Resolve all Sylvan Safekeeper abilities
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