Katara, Bending Prodigy + Ashnod's Altar + Nadir Kraken + Biomancer's Familiar + Chatterfang, Squirrel General

How it works

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Activate Katara by paying at most due to Biomancer's Familiar, causing you to draw a card.
Nadir Kraken triggers, causing you to pay to put a +1/+1 counter on it and create two creature tokens.
Activate Katara by paying at most and tapping the creature tokens.
Holding priority, activate Ashnod's Altar twice by sacrificing the creature tokens, adding .
Resolve the Katara ability, causing you to draw a card.
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.