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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.

A spell is modal if it has two or more options in a bulleted list and instructions for a player to choose a number of those options, such as "Choose one" or "Choose one or more." Each of those options is a mode. Spells with spree are modal spells.

The X in Riku's ability is the number of times you chose a mode for the modal spell you cast, not the number of distinct modes you chose. For example, if you cast a modal spell that allows you to choose the same mode more than once and you choose the same mode three times, X is three and you may choose up to all modes of Riku's ability.

Modal spells printed prior to the Khans of Tarkir™ release didn't use bulleted lists for the modes; these cards have received errata in the Oracle card reference.

You pay all costs and follow all normal timing rules for cards played from exile with Riku's triggered ability. For example, if the exiled card is a land card, you may play it only during your main phase while the stack is empty.

You can't choose the same mode of Riku's triggered ability more than once each time it triggers.