Phylath, World Sculptor + Cloudstone Curio + Phyrexian Altar

Exhibition

Decks

How it works

Cast Phylath either from your hand or from the command zone by paying and commander tax, if applicable.
When Phylath enters the battlefield, its first ability and Cloudstone Curio trigger.
Resolve the Phylath trigger, creating at least six 0/1 Plant creature tokens.
When the Plants enter the battlefield, Cloudstone Curio triggers that many times.
Resolve the first trigger, returning Phylath to your hand from the battlefield.
Resolve all remaining triggers, choosing not to return anything to your hand.
Activate Phyrexian Altar six times by sacrificing six Plants, adding .
Repeat.
If you control seven or more basic lands, this combo nets infinite Plant tokens and infinite colored 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.