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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 enough -1/-1 counters are put on a creature you control at the same time to make its toughness 0 or less, Host of the Hereafter’s last ability will see all of the +1/+1 counters it had when it died as well as the -1/-1 counters it had, and the same number of each of those types of counters (plus any other applicable counters) will be put onto the target creature.

If the creature that died had -1/-1 counters on it when it died, Host of the Hereafter’s ability will put those on the target creature as well. This may result in the recipient of the counters also dying.

Host of the Hereafter’s last ability puts all counters that were on the creature that died onto the target creature, not just its +1/+1 counters.

Host of the Hereafter’s last ability doesn’t cause you to move counters from the creature that died onto the target creature. Rather, you put the same number of each kind of counter the creature had when it died onto the target creature.

If Host of the Hereafter dies at the same time as one or more other creatures you control, Host of the Hereafter’s last ability triggers for each of those creatures that had counters on them, including itself if applicable.

In some unusual cases, you may end up putting the appropriate counters on more than one permanent. For example, if you control The Ozolith and Host of the Hereafter when a creature you control with counters on it dies, you’ll put the appropriate number of each kind of counter onto both The Ozolith and the target creature.