Search

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.

As Nihiloor's first triggered ability resolves, you choose up to one creature for each opponent, and tap them all at the same time. Then, a separate triggered ability is put on the stack for each creature you tapped this way. Those abilities are placed on the stack in the order you choose. If tapping those creature caused any other abilities you control to trigger, those are also placed on the stack at this time.

Both the tapped creature's power and the target creature's power are checked both as you put the ability on the stack and as the ability resolves in order to make sure the target is legal.

If the tapped creature is no longer on the battlefield as the trigger resolves, use its last existence on the battlefield to determine whether the target is still legal as the ability resolves.

If Nihiloor leaves the battlefield before its enters-the-battlefield ability resolves or before its reflexive triggered abilities resolve, then you won't gain control of any creatures.

If a creature you tapped for Nihiloor's ability is somehow no longer tapped as the reflexive triggered ability resolves, that ability will still resolve and you will still gain control of the target as long as it has less power than the creature you tapped.