Spiritcall Enthusiast // Scrollboost, Stormsplitter, and Phyrexian Altar

Prerequisites

• Spiritcall Enthusiast // Scrollboost on the battlefield
• Stormsplitter on the battlefield
• Phyrexian Altar on the battlefield
• plus the cost of the additional instant or sorcery available

Steps

1. Cast any instant or sorcery by paying its cost
2. Stormsplitter triggers, creating a token copy of itself
3. When that token enters, Spiritcall Enthusiast triggers, becoming prepared
4. Resolve the instant or sorcery from step 1
5. Cast a copy of Scrollboost from exile by paying and unpreparing Spiritcall Enthusiast
6. Both Stormsplitters trigger, creating two more token copies of Stormsplitter
7. When a token enters, Spiritcall Enthusiast triggers, becoming prepared
8. Resolve the copy of Scrollboost, giving one or two creatures +2/+2 until end of turn
9. Activate Phyrexian Altar by sacrificing one Stormsplitter token, adding
10. Activate any mana source, adding an additional
11. Cast a copy of Scrollboost from exile by paying and unpreparing Spiritcall Enthusiast
12. At least three Stormsplitters trigger, creating at least three more token copies of Stormsplitter
13. When a token enters, Spiritcall Enthusiast triggers, becoming prepared
14. Resolve the copy of Scrollboost, giving one or two creatures +2/+2 until end of turn
15. Activate Phyrexian Altar by sacrificing two Stormsplitter tokens, adding
16. Repeat from step 11 any number of times
17. Once you have infinite Stormsplitter tokens, you may activate Phyrexian Altar any number of times, adding infinite mana

Results

• Infinite ETB
• Infinite LTB
• Infinite colored mana
• Infinite creature tokens with haste
• Infinite death triggers
• Infinite magecraft triggers
• Infinite sacrifice triggers
• Infinite storm count
• Infinitely large creatures you control until end of turn