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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 a spell or ability allows you to cast a spell from your graveyard, the first step in doing so is to move it to the stack. That spell's additional and alternative costs may be applied. However, if a card's own ability allows you to cast it from your graveyard (such as a flashback ability) Yixlid Jailer stops that ability.

If a card with changeling is in a graveyard, it still has all creature types.

If a card in a graveyard has an ability that defines a * in its power or toughness, that * is 0. For example, Tarmogoyf is a 0/1 creature card in your graveyard while you control Yixlid Jailer.

Some cards have abilities that apply "as [this card] enters the battlefield" or state that "[this card] enters the battlefield with" counters. Although these cards won't have these abilities in the graveyard, they will be applied if the cards are put onto the battlefield from the graveyard (due to Zombify, perhaps). What matters is that these cards will have these abilities on the battlefield.

If an ability triggers when the object that has it is put into a graveyard from anywhere other than the battlefield, such as Krosan Tusker or Narcomoeba, that ability triggers from the graveyard. Yixlid Jailer stops those abilities from triggering at all. This includes abilities that trigger when a card is put into a graveyard "from anywhere," even if that card was on the battlefield.

Some replacement effects cause a card to be put somewhere else instead of being put into a graveyard (such as that of Darksteel Colossus). These effects mean the card is never actually put into the graveyard, so Yixlid Jailer doesn't affect that ability.

If an ability triggers when the object that has it is put into a graveyard from the battlefield, that ability triggers from the battlefield and isn't affected by Yixlid Jailer.