Regrowth, Emeritus of Abundance // Regrowth, Pyromancer Ascension, Early Harvest, and Shilgengar, Sire of Famine

Prerequisites

• Regrowth in the graveyard
• Emeritus of Abundance // Regrowth on the battlefield
• Pyromancer Ascension on the battlefield
• Early Harvest in hand
• Shilgengar, Sire of Famine on the battlefield
• available

Steps

1. Cast a copy of Regrowth from exile by paying , targeting any card besides the actual Regrowth
2. Pyromancer's Ascension's first ability triggers, allowing you to put a quest counter on it
3. Resolve the copy of Regrowth, returning that card from your graveyard to your hand
4. Declare Emeritus of Abundance as an attacker
5. When Emeritus of Abundance attacks, it triggers, becoming prepared
6. During your second main phase, cast a copy of Regrowth by paying , targeting the actual Regrowth card
7. Pyromancer Ascension's first ability triggers, allowing you to put a quest counter on it
8. Resolve the copy of Regrowth, returning Regrowth from your graveyard to your hand
9. Cast Early Harvest by paying its mana cost
10. Pyromancer Ascension's second ability triggers, copying Early Harvest
11. Resolve a copy of Early Harvest, untapping basic lands you control
12. Activate those lands by tapping them, adding mana
13. Resolve the remaining copy of Early Harvest, untapping lands you control
14. Activate those lands by tapping them, adding mana
15. Activate Shilgengar by sacrificing Emeritus of Abundance, producing that card's result
16. Cast the card Regrowth from your hand by paying , targeting Emeritus of Abundance
17. Pyromancer Ascension's second ability triggers, copying Regrowth and allowing you to target Early Harvest with the copy
18. Resolve both copies of Regrowth, returning Emeritus of Abundance and Early Harvest from your graveyard to your hand
19. Cast Early Harvest by paying its mana cost
20. Pyromancer Ascension's second ability triggers, copying Early Harvest
21. Resolve a copy of Early Harvest, untapping lands you control
22. Activate those lands by tapping them, adding mana
23. Resolve the remaining copy of Early Harvest, untapping lands you control
24. Activate those lands by tapping them, adding mana
25. Cast Emeritus of Abundance by paying
26. Cast a copy of Regrowth from exile by paying , targeting Early Harvest
27. Both of Pyromancer Ascension's abilities trigger
28. In response, activate Shilgengar by sacrificing Emeritus of Ideation, producing that card's result
29. Resolve Pyromancer Ascension's first abiliity, putting a redundant quest counter on it if desired
30. Resolve Pyromancer Ascension's second ability, copying Regrowth and targeting Emeritus of Abundance with the copy
31. Repeat from step 18

Results

• Infinite Blood tokens
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite magecraft triggers
• Infinite sacrifice triggers
• Infinite untap of basic lands you control