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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.

Grave Betrayal doesn't overwrite any previous colors or types. Rather, it adds another color and another creature type.

In a multiplayer game, if more than one player controls a Grave Betrayal and a creature controlled by none of those players dies, each Grave Betrayal will create a delayed triggered ability at the beginning of the next end step. The first such ability to resolve will return the creature. Usually, this will be one controlled by the player furthest from the active player in turn order.

The phrase "with an additional +1/+1 counter on it" means that the creature enters with one more +1/+1 counter than it would normally enter with. It doesn't keep any counters it had on it when it died.

If a creature you don't control dies during the end step, that creature won't return to the battlefield until the beginning of the next end step.

If the creature card leaves the graveyard before the delayed triggered ability resolves, it won't return to the battlefield. This is also true if the card leaves the graveyard and returns to the graveyard before that ability resolves.

If the creature is normally colorless, it will simply be black. It won't be both black and colorless.

Each creature you don't control that dies causes a delayed triggered ability to trigger at the beginning of the next end step. If there are multiple such abilities, you can put them on the stack in any order. The creatures will return to the battlefield one at a time as each ability resolves. The last ability you put on the stack will be the first one to resolve.