Planar Nexus + Plaza of Harmony

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Overview

Yes. Planar Nexus is a Gate (it’s every nonbasic land type) [205.3i][305.8], and Plaza of Harmony’s second ability can produce any mana type that a Gate you control could produce; because Planar Nexus has an activated ability that can add one mana of any color, Plaza can be tapped to add any color without you having to pay Planar Nexus’s activation cost [605.1a][2024-06-07][2019-01-25].

The StackRules & CitationsDetails & Edge Cases

Step 1

Verify Planar Nexus is a Gate because it’s every nonbasic land type (so it has the Gate subtype) [205.3i][305.8].

Step 2

Identify what mana types Gates you control could produce by looking at their mana abilities; Planar Nexus has an ability that can add one mana of any color, so Planar Nexus is capable of producing white, blue, black, red, green, and also can produce colorless via its : Add ability [605.1a][2019-01-25].

Step 3

Activate Plaza of Harmony’s second ability: tap Plaza. You then choose one mana type from the set of mana types that a Gate you control could produce (you may choose any color Planar Nexus could produce) and Plaza adds one mana of that chosen type [605.3b].

Step 4

You do not need to pay Planar Nexus’s cost or tap Planar Nexus to satisfy Plaza’s ability; Plaza’s ability does not copy or cause Planar Nexus to produce mana, it simply looks at the mana types Gates are able to produce and produces one of those types itself.

Resolution

Plaza of Harmony’s : Add one mana of any type that a Gate you control could produce can produce any color that Planar Nexus could produce via its own mana ability; you do not have to pay Planar Nexus’s cost in order for Plaza to produce that color [605.1a][2024-06-07][2019-01-25].