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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.

Creatures return to the control of their owners, regardless of who controls the Haven when it is sacrificed.

When creatures return to the battlefield, they are put onto the battlefield as if just cast. Creatures with X in the mana cost are treated as X is zero. Creatures which can pay costs when put onto the battlefield to determine abilities must have those costs paid at this time.

Auras on creatures are put into the graveyard and counters on creatures are removed when the creatures are sent to the Haven.

All cards in the Haven stay there even if they cease to be creatures. When the Haven is sacrificed, the cards come back onto the battlefield whether or not they are creatures.

Creatures return to the battlefield simultaneously.

Token creatures cease to exist when they leave the battlefield, so this effect just exiles them with no chance to bring them back like you can with cards.

When the creature leaves the battlefield any damage or “will be destroyed at some future time” effects are removed from the creature.

If changed to another land type, the creature cards are not lost but can’t be released until the land reverts to normal.