Moss-Pit Skeleton + Chalk Outline + Cloakwood Swarmkeeper + Sage of the Falls

How it works

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Put a +1/+1 counter on a creature you control.
Moss-Pit Skeleton triggers, putting it from your graveyard onto the top of your library.
Chalk Outline triggers, creating a 2/2 Detective creature token and a Clue token.
When the Clue and Detective enter the battlefield, Sage of the Falls and Cloakwood Swarmkeeper trigger.
Resolve the Sage of the Falls trigger, drawing Moss-Pit Skeleton from your library, and then discarding it.
Resolve the Cloakwood Swarmkeeper trigger, putting a +1/+1 counter on it.
Repeat from step 2.

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.