"Chronicles across the ages describe Jodah. They likely refer not to one mage, but to a family or an arcane title."
—Arkol, Argivian scholar

Jodah, Archmage Eternal

Flying
You may pay {W}{U}{B}{R}{G} rather than pay the mana cost for spells you cast.

Double Masters 2022

Flying
You may pay {W}{U}{B}{R}{G} rather than pay the mana cost for spells that you cast.

Dominaria Promos

Dominaria

If you apply Jodah's alternative cost to a spell with {X} in its mana cost, X is 0.

If you cast a spell for which mana may be spent as though it were mana of any color, you may cast it for Jodah's alternative cost and still spend mana as though it were mana of any color.

Jodah's ability is an alternative cost to cast a spell. You can't combine this with other alternative costs, such as flashback. You can pay additional costs, such as kicker, in addition to this alternative cost.