Regrowth + Emeritus of Abundance // Regrowth + Pyromancer Ascension + Ashnod's Altar + Brass's Bounty

Regrowth

Emeritus of Abundance // Regrowth

Pyromancer Ascension

Ashnod's Altar

Brass's Bounty

How it works

1. Cast Brass's Bounty by paying 6, 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 1, 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 1, 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 6.
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 Ashnod's Altar by sacrificing Emeritus of Abundance, adding CC.
17. Cast the card Regrowth from your hand by paying 1, 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 2.
25. Cast a copy of Regrowth from exile by paying 1, targeting Brass's Bounty.
26. Both of Pyromancer Ascension's abilities trigger.
27. In response, activate Ashnod's Altar by sacrificing Emeritus of Ideation, adding CC.
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.

This elegant, treasure-fueled loop hinges on Pyromancer Ascension acting as a reliable spell-multiplier once it has accumulated two or more quest counters. By casting Brass's Bounty with eight or more lands in play, you generate an abundance of Treasure tokens to fund your recursive engine. Ashnod's Altar provides a convenient sacrifice outlet to bin creatures like Emeritus of Abundance (also utilizing its front/back card versatility as Regrowth) at a moment's notice. Finally, Regrowth loops continuously through your graveyard to pull back whatever vital piece you need next, chaining into infinite mana, sacrifices, and spell copies.