Astral Dragon onto the battlefield (note this is not "created" so it is not doubled).
When the
Astral Dragon token enters the battlefield, it triggers itself, creating four token copies of TOKEN DOUBLER that are 3/3 Dragon creatures in addition to their other types.
Resolve the original
Astral Dragon spell from step 1.
When
Astral Dragon enters the battlefield, it triggers, creating 64 token copies of TOKEN DOUBLER that are 3/3 Dragon creatures in addition to their other types.
Results
Near-infinite creature ETB.
Near-infinite creature tokens.
Metadata
Bracket tag
ExhibitionBracket 1+
For any deck
1
2
3
4
5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.