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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.

You choose which player or planeswalker Zareth San is attacking. It doesn't have to be attacking the same player or planeswalker that the returned Rogue was attacking.

Before blockers are declared, attacking Rogues are neither blocked nor unblocked, so you can't pay the cost to activate Zareth San's second ability.

Although Zareth San is attacking, it was never declared as an attacking creature (for purposes of abilities that trigger whenever a creature attacks, for example).

To activate Zareth San's second ability, you reveal it in your hand. It remains revealed until the ability has resolved.

Zareth San's second ability can be activated during the declare blockers step, combat damage step, or end of combat step. If you wait until after the declare blockers step, because all combat damage is dealt at once, Zareth San won't normally deal combat damage.

If Zareth San leaves your hand before its second ability resolves, the ability does nothing as it resolves. Zareth San remains in its new zone and the Rogue you returned remains in its owner's hand.

If a creature in combat has first strike or double strike, you can activate Zareth San's second ability during the first-strike combat damage step. Zareth San will deal combat damage during the regular combat damage step in this case, even if it somehow gains first strike.

In a multiplayer game, if a player leaves the game, all cards that player owns leave as well. If you leave the game, any permanents you control from Zareth San's last ability are exiled.