Regrowth, Emeritus of Abundance // Regrowth, Pyromancer Ascension, Bartolomé del Presidio, and Brass's Bounty

Prerequisites

• Regrowth in the graveyard
• Emeritus of Abundance // Regrowth on the battlefield
• Pyromancer Ascension on the battlefield
• Bartolomé del Presidio on the battlefield
• Brass's Bounty in hand
• available

Steps

1. Cast Brass's Bounty by paying , creating at least eight Treasure tokens
2. Activate two of those Treasure tokens by tapping and sacrificing them, adding two mana
3. Cast a copy of Regrowth from exile by paying , targeting Brass's Bounty
4. Pyromancer's Ascension's first ability triggers, allowing you to put a quest counter on it
5. Resolve the copy of Regrowth, returning Brass's Bounty from your graveyard to your hand
6. Declare Emeritus of Abundance as an attacker
7. When Emeritus of Abundance attacks, it triggers, becoming prepared
8. During your second main phase, activate your remaining Treasure tokens by tapping and sacrificing them, adding at least six mana
9. Cast a copy of Regrowth by paying , targeting the actual Regrowth card
10. Pyromancer Ascension's first ability triggers, allowing you to put a quest counter on it
11. Resolve the copy of Regrowth, returning Regrowth from your graveyard to your hand
12. Cast Brass's Bounty by paying
13. Pyromancer Ascension's second ability triggers, copying Brass's Bounty
14. Resolve both copies of Brass's Bounty, creating at least sixteen Treasure tokens
15. Activate those Treasure tokens by tapping and sacrificing them, adding at least sixteen mana
16. Activate Bartolomé del Presidio by sacrificing Emeritus of Abundance, putting a +1/+1 counter on it
17. Cast the card Regrowth from your hand by paying , targeting Emeritus of Abundance
18. Pyromancer Ascension's second ability triggers, copying Regrowth and allowing you to target Brass's Bounty with the copy
19. Resolve both copies of Regrowth, returning Emeritus of Abundance and Brass's Bounty from your graveyard to your hand
20. Cast Brass's Bounty by paying its mana cost
21. Pyromancer Ascension's second ability triggers, copying Brass's Bounty
22. Resolve both copies of Brass's Bounty, creating at least sixteen Treasure tokens
23. Activate those Treasure tokens by tapping and sacrificing them, adding at least sixteen mana
24. Cast Emeritus of Abundance by paying
25. Cast a copy of Regrowth from exile by paying , targeting Brass's Bounty
26. Both of Pyromancer Ascension's abilities trigger
27. In response, activate Bartolomé del Presidio by sacrificing Emeritus of Ideation, putting a +1/+1 counter on it
28. Resolve Pyromancer Ascension's first abiliity, putting a redundant quest counter on it if desired
29. Resolve Pyromancer Ascension's second ability, copying Regrowth and targeting Emeritus of Abundance with the copy
30. Repeat from step 19

Results

• Infinite +1/+1 counters on a creature
• Infinite ETB
• Infinite LTB
• Infinite colored mana
• Infinite death triggers
• Infinite magecraft triggers
• Infinite sacrifice triggers