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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.

Elderscale Wurm’s last ability doesn’t prevent damage. It only changes the result of damage dealt to you. For example, a creature will lifelink that deals damage to you will still cause its controller to gain life, even if that damage would reduce your life total to less than 7.

If damage is dealt to you and Elderscale Wurm at the same time, and that damage is enough to destroy Elderscale Wurm and reduce your life total to 7 or less, Elderscale Wurm’s ability will still apply. For example, if you have 10 life and a spell deals 10 damage to you and 10 damage to Elderscale Wurm, you’ll end up at 7 life and Elderscale Wurm will be destroyed.

If you have less than 7 life, damage dealt to you reduces your life total as normal.

Elderscale Wurm’s last ability doesn’t affect the loss or payment of life.

In a Commander game, combat damage you’re dealt by a commander is still tracked, even if it doesn’t change your life total.