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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.

If Sasaya's Essence's controller has four Mossfire Valley and taps one of them for {R}{G}, the Essence will add three mana (one for each other Mossfire Valley) of any combination of {R} and/or {G}.

Sasaya's Essence has a triggered mana ability. Like activated mana abilities, the triggered mana ability doesn't use the stack.

If Sasaya's Essence's controller has four Forests and taps one of them for {G}, the Essence will add {G}{G}{G} for a total of {G}{G}{G}{G}.

The triggered mana ability counts the number of other lands with that same name and adds that much mana. The type (that is, the color of mana or colorless mana) is the same as the mana the land just produced.

If Sasaya's Essence's controller has two Brushlands and taps one of them for {W}, Sasaya's Essence adds another {W}. It won't produce {G} or {C} unless the land was tapped for {G} or {C} instead.

Each Ascendant is legendary in both its unflipped and flipped forms. This means that effects that look for legendary creature cards, such as Time of Need and Captain Sisay, can find an Ascendant.

You don't need to have seven lands in hand to reveal your hand. You leave your hand revealed until the ability resolves. If you don't have seven or more land cards in your hand at that time, the effect does nothing.

You don't need to tap Sasaya to use its ability, so you can activate the ability on the turn Sasaya comes under your control.