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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 Angel of Fury is removed from the graveyard after the ability triggers but before it resolves, it will remain in its zone when its owner shuffles their library. Similarly, if a replacement effect has it move to a different zone instead of being put into the graveyard, the ability won’t trigger at all.

Angel of Fury’s second ability is a leaves-the-battlefield ability. Because it works only from on the battlefield, it behaves differently than the _Lorwyn_ Incarnations. When Angel of Fury is put into a graveyard from the battlefield, it will look back in time (to the point just before it left the battlefield) to see if its ability triggers. That means the following: — If Angel of Fury lost its triggered ability while on the battlefield (due to Snakeform, for example) and then was destroyed, the ability would not trigger. Angel of Fury would stay in its owner’s graveyard. — If Angel of Fury had its triggered ability when it left the battlefield, but lost it when it was put into the graveyard (due to Yixlid Jailer, for example), the ability would still trigger. Angel of Fury would be shuffled into its owner’s library.