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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.

Angel of Grace's triggered ability doesn't prevent damage. It only changes the result of damage dealt to you. For example, a creature with 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 1.

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

Angel of Grace's triggered ability doesn't stop loss of life from effects that say that you lose life.

For a player's life total to become 10, that player gains or loses the appropriate amount of life. For example, if your life total is 2, Angel of Grace's last ability will cause you to gain 8 life; alternatively, if your life total is 20, it will cause you to lose 10 life. Other cards that interact with life gain or life loss will interact with this effect accordingly.

In a Two-Headed Giant game, after resolving Angel of Grace's triggered ability, damage dealt to you and/or your teammate that would reduce your team's life total to less than 1 reduces it to 1 instead.

In a Two-Headed Giant game, the activated ability of Angel of Grace causes you to gain or lose life so that your team's life total becomes 10.

If you have less than 1 life and somehow haven't lost the game, damage dealt to you reduces your life total further below 0 (as normal).