Activate Atla by paying and tapping it, creating an 0/1 Egg creature token with defender.
Activate a nontoken creature you control using the ability granted to it by
Ghired by tapping it, creating a copy of the Egg token.
Activate
Phantom Train by sacrificing an Egg token.
When the Egg dies, Atla triggers, causing you to reveal cards from the top of your library until you reveal a creature card and put it onto the battlefield.
Resolve the
Phantom Train ability, putting a +1/+1 counter on
Phantom Train and causing it to become a creature until end of turn.
Repeat from step 2.
Results
Near-infinite +1/+1 counters on a creature.
Near-infinite creature ETB.
Near-infinite creature LTB.
Near-infinite creature sacrifice triggers.
Near-infinite death triggers.
Put all creature cards from your library onto the battlefield tapped.
Metadata
Bracket tag
ExhibitionBracket 1+
For any deck
1
2
3
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5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.