The Jolly Balloon Man | Ertha Jo, Frontier Mentor | Derevi, Empyrial Tactician

Cards

Activate a mana-producing creature by tapping it, adding at least ({1} magic symbol) .
Activate
The Jolly Balloon Man by paying ({1} magic symbol) and tapping it, targeting the mana-producing creature.
Ertha Jo triggers, copying
The Jolly Balloon Man's ability, targeting
Derevi.
Resolve the copy of
The Jolly Balloon Man's ability, creating a token copy of
Derevi that is a 1/1 Balloon with haste.
Put the
Derevi token into your graveyard due to the legend rule.
When the
Derevi token enters the battlefield, it triggers, untapping
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} magic symbol) .
Repeat from step 2.