25 Jan 2019
Any additions to a Gate’s land types or abilities gained by a Gate can affect the types of mana a Gate can produce.
25 Jan 2019
The types of mana are white, blue, black, red, green, and colorless.
25 Jan 2019
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.