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.

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.