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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.

Spells you cast that share multiple card types with the exiled card still cost just {2} less to cast. They don't get a greater cost reduction.

Semblance Anvil takes the total cost to cast a spell into account, not just its mana cost. This includes additional costs (such as kicker) and alternative costs (such as evoke). It also includes cost increases from other sources (such as Lodestone Golem's ability).

Semblance Anvil's cost reduction effect is mandatory.

Semblance Anvil can reduce the amount you pay for a spell's cost that includes {X}. For example, Blaze is a sorcery that costs {X}{R}. If the card exiled with Semblance Anvil is a sorcery, and you want to cast Blaze with X equal to 5, you'll have to pay only {3}{R}. This is true even if the ability states that {X} must be paid with a certain color of mana (as Drain Life does).

Semblance Anvil won't affect the part of a spell's cost represented by colored mana symbols. For example, a spell that normally costs {1}{U} to cast would cost {U} if it shared a card type with the exiled card.

Artifact, battle, creature, enchantment, instant, kindred, planeswalker, and sorcery are card types.