Maskwood Nexus + The World Tree

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Overview

Maskwood Nexus only affects objects that are creatures (and creature spells/cards) so it makes your creatures every creature type; it does not turn lands into creatures and thus does not interact with The World Tree’s land status or its granted mana ability. See rule [205.3d] and Ruling [2021-02-05]. The World Tree’s granted ": Add one mana of any color" is a mana ability under [605.1a] and remains a land ability; Maskwood Nexus does not remove or add land abilities per Ruling [2021-02-05].

The StackRules & CitationsDetails & Edge Cases

Step 1

Maskwood Nexus’s static ability applies to creatures you control, making those creatures every creature type (this applies to creature permanents, creature spells you control, and creature cards you own that aren’t on the battlefield) — this text is in Maskwood Nexus’s Oracle text and concerns creature objects.

Step 2

The World Tree is a land permanent. Its static ability (the conditional line that makes lands you control have ": Add one mana of any color") gives an activated mana ability to lands you control; that ability meets the criteria in [605.1a] and is therefore a mana ability.

Step 3

Because Maskwood Nexus only affects creatures (and creature spells/cards), it does not change The World Tree, which is not a creature by itself, so The World Tree does not gain creature types from Maskwood Nexus. This follows from the constraint that an object can’t gain subtypes that don’t correspond to one of that object’s types [205.3d].

Step 4

Ruling [2021-02-05] confirms The World Tree’s third ability doesn’t cause lands to lose abilities or change land types; Maskwood Nexus does not remove or add land abilities either, so both types of abilities coexist on their respective objects.

Step 5

If a permanent happens to be both a land and a creature because of some other effect (for example, an effect that animates lands), then Maskwood Nexus will apply to it because it is a creature at that time; see [300.2] and [205.3c] for how multiple types and subtypes are handled.

Resolution

If you control both Maskwood Nexus and The World Tree, Maskwood Nexus makes only your creatures become every creature type; The World Tree remains only a land and keeps (and grants) its mana ability. Maskwood Nexus does not cause The World Tree to become a creature, nor does The World Tree’s text change creature types. If a permanent that is a creature (including a land that has become a creature by some other effect) is affected by multiple effects that set creature type, the specific overwriting interactions described in the changeling ruling apply (Ruling [2021-02-05]). See [205.3d], [300.2], [605.1a], and Ruling [2021-02-05].