Activate a mana-producing creature by tapping it, adding at least {1}.
Activate The Jolly Balloon Man by paying {1} and tapping it, targeting the mana-producing creature.
Ertha Jo triggers, copying The Jolly Balloon Man's ability, targeting Restoration Angel.
Resolve the copy of The Jolly Balloon Man's ability, creating a token copy of Restoration Angel that is a 1/1 Balloon with haste.
When Restoration Angel enters the battlefield, it triggers, blinking The Jolly Balloon Man.
Resolve the Jolly Ballon Man ability from step 2, creating a token copy of the mana-producing creature that is a 1/1 Balloon with haste.
Activate the mana-producing creature token by tapping it, adding at least {1}.
Repeat from step 2.

Infinite creature LTB

Infinite creature ETB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite creature tokens with haste

The Jolly Balloon Man

Ertha Jo, Frontier Mentor

Restoration Angel

Activate a mana-producing creature by tapping it, adding at least {1}.
Activate The Jolly Balloon Man by paying {1} and tapping it, targeting the mana-producing creature.
Ertha Jo triggers, copying The Jolly Balloon Man's ability, targeting Felidar Guardian.
Resolve the copy of The Jolly Balloon Man's ability, creating a token copy of Felidar Guardian that is a 1/1 Balloon with haste.
When Felidar Guardian enters the battlefield, it triggers, blinking The Jolly Balloon Man.
Resolve the Jolly Ballon Man ability from step 2, creating a token copy of the mana-producing creature that is a 1/1 Balloon with haste.
Activate the mana-producing creature token by tapping it, adding at least {1}.
Repeat from step 2.

Felidar Guardian

Activate a mana-producing creature by tapping it, adding at least {1}.
Activate The Jolly Balloon Man by paying {1} and tapping it, targeting the mana-producing creature.
Ertha Jo triggers, copying The Jolly Balloon Man's ability, targeting Icewind Stalwart.
Resolve the copy of The Jolly Balloon Man's ability, creating a token copy of Icewind Stalwart that is a 1/1 Balloon with haste.
When Icewind Stalwart enters the battlefield, it triggers, blinking The Jolly Balloon Man.
Resolve the Jolly Ballon Man ability from step 2, creating a token copy of the mana-producing creature that is a 1/1 Balloon with haste.
Activate the mana-producing creature token by tapping it, adding at least {1}.
Repeat from step 2.

Icewind Stalwart

Activate a mana-producing creature by tapping it, adding at least {1}.
Activate The Jolly Balloon Man by paying {1} and tapping it, targeting the mana-producing creature.
Ertha Jo triggers, copying The Jolly Balloon Man's ability, targeting Wispweaver Angel.
Resolve the copy of The Jolly Balloon Man's ability, creating a token copy of Wispweaver Angel that is a 1/1 Balloon with haste.
When Wispweaver Angel enters the battlefield, it triggers, blinking The Jolly Balloon Man.
Resolve the Jolly Ballon Man ability from step 2, creating a token copy of the mana-producing creature that is a 1/1 Balloon with haste.
Activate the mana-producing creature token by tapping it, adding at least {1}.
Repeat from step 2.

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