Plaza of Harmony
Land
When this land enters, if you control two or more Gates, you gain 3 life.
: Add 
.
: Add one mana of any type that a Gate you control could produce.
Jedd Chevrier
The List (PLST)
• #RNA-254Rulings
The types of mana are white, blue, black, red, green, and colorless.
(wotc • 2019-01-25)
Any additions to a Gate’s land types or abilities gained by a Gate can affect the types of mana a Gate can produce.
(wotc • 2019-01-25)
Plaza of Harmony checks the effects of all mana-producing abilities of Gates you control, but it doesn’t check their costs or legality. For example, it doesn’t check whether a Gate is untapped.
(wotc • 2019-01-25)
Rulings
The types of mana are white, blue, black, red, green, and colorless.
(wotc • 2019-01-25)
Any additions to a Gate’s land types or abilities gained by a Gate can affect the types of mana a Gate can produce.
(wotc • 2019-01-25)
Plaza of Harmony checks the effects of all mana-producing abilities of Gates you control, but it doesn’t check their costs or legality. For example, it doesn’t check whether a Gate is untapped.
(wotc • 2019-01-25)