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If an ability would produce one or more mana of an undefined type, it produces no mana instead.

Some abilities produce mana based on the type of mana another permanent or permanents “could produce.” The type of mana a permanent could produce at any time includes any type of mana that an ability of that permanent would produce if the ability were to resolve at that time, taking into account any applicable replacement effects in any possible order. Ignore whether any costs of the ability could or could not be paid. If that permanent wouldn’t produce any mana under these conditions, or no type of mana can be defined this way, there’s no type of mana it could produce.

To “tap [a permanent] for mana” is to activate a mana ability of that permanent that includes the {T} symbol in its activation cost. See rule 605, “Mana Abilities.”

An ability that triggers whenever a permanent “is tapped for mana” or is tapped for mana of a specified type triggers whenever such a mana ability resolves and produces mana or the specified type of mana.

A replacement effect that applies if a permanent “is tapped for mana” or tapped for mana of a specific type and/or amount modifies the mana production event while such an ability is resolving and producing mana or the specified type and/or amount of mana.

If an object’s enters-the-battlefield triggered ability or replacement effect refers to X, and the spell that became that object as it resolved had a value of X chosen for any of its costs, the value of X for that ability is the same as the value of X for that spell, although the value of X for that permanent is 0. This is an exception to rule 107.3i.

The tap symbol is {T}. The tap symbol in an activation cost means “Tap this permanent.” A permanent that’s already tapped can’t be tapped again to pay the cost. A creature’s activated ability with the tap symbol in its activation cost can’t be activated unless the creature has been under its controller’s control continuously since their most recent turn began. See rule 302.6.

The untap symbol is {Q}. The untap symbol in an activation cost means “Untap this permanent.” A permanent that’s already untapped can’t be untapped again to pay the cost. A creature’s activated ability with the untap symbol in its activation cost can’t be activated unless the creature has been under its controller’s control continuously since their most recent turn began. See rule 302.6.

If a player attacks with multiple creatures with power 4 or greater, that player chooses one player or planeswalker those creatures are attacking, and Interplanar Brushwagg ends up attacking that player or planeswalker.

If an interplanar permanent gains an ability that refers to its controller or refers to “you,” that part of the ability has no effect.

Any effects that say that Interplanar Brushwagg can’t attack or can’t attack a certain player (such as that of Propaganda, or if Interplanar Brushwagg gains defender) affect only the declaration of attackers. They won’t stop Interplanar Brushwagg from becoming an attacking creature through its triggered ability.

An interplanar permanent is a permanent that you don’t control, but it’s not a permanent an opponent controls.

If multiple triggered abilities of interplanar permanents need to be put on the stack, the active player puts them on the stack in any order they choose after all players have put any triggered abilities they control onto the stack. (In other words, the triggered abilities of interplanar permanents will resolve first.) These abilities have no controller.

If a non-interplanar permanent becomes a copy of an interplanar permanent, the first permanent is still non-interplanar. If an interplanar permanent becomes a copy of a non-interplanar permanent, the first permanent is still interplanar.

Objects on the interplanar battlefield are on the battlefield and are known as interplanar permanents.

If an effect refers to an interplanar permanent’s controller, that part of the effect doesn’t happen.

If an effect attempts to give a player control of an interplanar permanent, that part of the effect doesn’t happen.

Interplanar Brushwagg may end up attacking its owner this way.

Although Interplanar Brushwagg is an attacking creature if it uses its triggered ability, it was never declared as an attacking creature. This means that abilities that trigger whenever a creature attacks won’t trigger when it becomes attacking.