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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 Ojer Axonil's second ability and additional replacement effects would modify how damage would be dealt, the player being dealt damage chooses the order in which to apply those effects.

For the purpose of Temple of Power's last ability, you need to have controlled the red source that dealt noncombat damage only at the time that the damage was dealt. If it dies or changes control after that point, that damage will still count toward Temple of Power's activation restriction.

While you control Ojer Axonil, Deepest Might, if an effect such as that of Chandra's Pyrohelix asks you to divide damage among targets, you must divide the unmodified damage.

The comparison between the amount of noncombat damage being dealt and Ojer Axonil's power occurs only once, when the damage would be dealt. Reducing Ojer Axonil's power before noncombat damage is dealt may cause its replacement effect not to apply to that damage.

The 4 or more noncombat damage may be dealt by multiple red sources you controlled. For example, if you cast a red spell that dealt 3 damage to a creature and then a red artifact you controlled dealt 1 noncombat damage to a creature, you could activate Temple of Power's last ability.

If a card that isn't a transforming double-faced card is a copy of Ojer Axonil, Deepest Might, it won't return to the battlefield when it dies.