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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.

While the enchanted player can still activate mana abilities and loyalty abilities, creatures that player controls won't normally have any of those abilities to be activated.

An activated mana ability is one that produces mana as it resolves, not one that costs mana to activate. A loyalty ability is an ability of a planeswalker whose cost specifies how many loyalty counters to give or remove.

If Overwhelming Splendor leaves the battlefield at the same time as a creature enchanted player controls, any "when [this creature] [dies or leaves the battlefield]" abilities of that creature won't trigger.

If a noncreature permanent becomes a creature, it will lose all abilities it has. However, if the effect that makes that permanent a creature grants it an ability, it will continue to have that ability. For example, the enchanted player's Riddleform will have flying once it becomes a creature.

Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keyword abilities (such as equip and eternalize) are activated abilities and will have colons in their reminder text. Triggered abilities (starting with "when," "whenever," or "at") of noncreature permanents are unaffected by the last ability of Overwhelming Splendor.

If an effect grants a creature an ability after Overwhelming Splendor has become attached to its controller, that creature won't lose that ability.

Effects that modify a creature's power and/or toughness, such as the effect of Titanic Growth, will apply to the creatures no matter when they started to take effect. The same is true for any counters that change their power and/or toughness.

Overwhelming Splendor overwrites all previous effects that set a creature's base power and toughness to specific values. Any power- or toughness-setting effects that start to apply to a creature after Overwhelming Splendor becomes attached to its controller will overwrite this effect. For example, the enchanted player's Riddleform will become a 3/3 creature if player casts a noncreature spell.

If a creature enters the battlefield under enchanted player's control, any "when [this creature] enters the battlefield" abilities of that creature won't trigger. Any "as [this creature] enters the battlefield" or "[this creature] enters the battlefield with" abilities won't be applied.