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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.

While Spark Rupture is on the battlefield, planeswalkers will enter the battlefield as creatures, but with the appropriate number of loyalty counters. For example, a planeswalker that normally enters with three loyalty counters on it will enter as a 3/3 creature and have three loyalty counters on it.

A planeswalker that becomes a creature due to Spark Rupture is no longer a planeswalker. It can no longer be attacked, and damage dealt to it won't cause it to lose loyalty counters.

If a planeswalker-turned-creature has all loyalty counters removed from it, Spark Rupture's effect will stop applying to it. It will momentarily return to being a planeswalker, but as it has no loyalty counters, it will soon find itself in the graveyard. If this happens, you won't have priority to activate any of its loyalty abilities before the planeswalker is put into its owner's graveyard.

The resulting creature's power and toughness will change if the number of loyalty counters on it changes.

In some unusual cases, Spark Rupture may enter the battlefield during a combat in which a planeswalker has been attacked. In such a case, that planeswalker will be removed from combat. If blockers haven't been declared yet, the resulting creature may block. Creatures that were attacking that planeswalker remain attacking and can be blocked, but they won't deal combat damage if unblocked.

A planeswalker affected by Spark Rupture loses all abilities it has, not only loyalty abilities. The resulting creature may gain abilities after Spark Rupture enters the battlefield.