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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 multiple creatures would deal combat damage to you and your creatures at the same time, this prevents X of the damage that would be dealt by each of them. This prevention is applied creature by creature. For example, if Cover of Winter has two age counters and you're being attacked by an unblocked 1/1 and an unblocked 4/4, this will prevent 2 of the combat damage that would be dealt by each one. All damage from the 1/1 is prevented and 2 damage from the 4/4 is prevented, meaning you're dealt 2 damage.

If a creature has double strike, Cover of Winter prevents X of the combat damage it would deal during each combat damage step.

If a creature's combat damage is assigned to multiple recipients (for example, if it has trample and is blocked by two creatures, and damage is assigned to each of those creatures and to you), you decide how to divide the prevention effect. You may prevent damage that would be dealt to the first creature, the second creature, and/or you, as long as the total amount of that creature's damage that would be prevented is X.

Cover of Winter's replacement effect prevents combat damage creatures would deal to you and to attacking or blocking creatures you control.