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

Some spells or abilities that produce mana restrict how that mana can be spent, have an additional effect that affects the spell or ability that mana is spent on, or create a delayed triggered ability (see rule 603.7a) that triggers when that mana is spent. This doesn’t affect the mana’s type.

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.

If each creature the defending player controls can’t block for any reason (such as being tapped), then the target creature isn’t blocked. If there’s a cost associated with blocking the target creature, the defending player isn’t forced to pay that cost, so it doesn’t have to be blocked in that case either.

A creature “fights” when an effect instructs it to fight. Dealing combat damage isn’t fighting.

The defending player, not you, chooses which creature blocks the target creature.

You draw just one card as Neyith’s first ability resolves, no matter how many creatures you control fought or became blocked.

If an effect instructs you to “double” a creature’s power, that creature gets +X/+0, where X is its power as that effect begins to apply. If its power is negative, instead it gets -X/-0 where X is how far below 0 its power is. The value of X won’t change if another effect alters the creature’s power later in the turn.

While resolving Neyith’s last ability, you can’t pay multiple times to double a creature’s power more than once or to double more than one creature’s power.

If the target creature has menace, two creatures must block it if able.

Only one creature is required to block the target creature. Other creatures may also block it and are free to block other creatures or not block at all.