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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.

In a multiplayer game, if a player leaves the game, all cards that player owns leave as well. If you leave the game, any spells and/or permanents you control from Robber of the Rich's effect are exiled.

If the defending player doesn't have more cards in hand than you immediately after Robber of the Rich attacks, its ability doesn't trigger at all. If that player doesn't have more cards in hand as the ability resolves, the ability does nothing. It doesn't matter if that player has fewer or the same number of cards in hand in between these two times, or if they have fewer or the same number of cards in hand later.

The card Robber of the Rich exiles is exiled face up.

You can cast the exiled card if the Rogue that attacked is still in combat, if it's left combat, if it's left the battlefield, or even if combat is over.

If you cast an Adventure with Robber of the Rich, it's you, not the card's owner, who may cast the creature later.

If Robber of the Rich leaves the battlefield, the effect allowing you to cast the exiled card if you attacked with a Rogue continues to apply, even during later turns—as long as you attack with a Rogue during those later turns.

Robber of the Rich's effect doesn't change when you can cast the exiled card. For example, if you exile a sorcery card, you can cast it only during your main phase when the stack is empty.

An effect that instructs you to “cast” a card doesn't allow you to play lands.

Casting an exiled card causes it to leave exile. You can't cast it multiple times.

If a creature is attacking a planeswalker, the controller of the planeswalker is the defending player.