Spiritcall Enthusiast // Scrollboost + Stormsplitter + Phyrexian Altar

Exhibition

How it works

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

In which brackets is this combo allowed, per Spellbook's Exhibition tier?

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.

How it works

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