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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.

Melira doesn't remove any poison counters you already have or any -1/-1 counters already on creatures you control.

It's possible for a creature an opponent controls to gain infect after Melira enters. For example, your opponent could cast Glistening Oil on a creature, and then Melira's ability and Glistening Oil's ability would be applied in timestamp order, with the most recent effect winning. The damage dealt to you by such a creature won't result in you losing life (because the creature has infect) or in you getting poison counters (because Melira stops them). Similarly, damage dealt to a creature you control by such a creature won't result in damage being marked on the creature or in -1/-1 counters. However, abilities that check whether damage was dealt (such as lifelink or Whispering Specter's triggered ability) will still see that damage.

Damage dealt to planeswalkers you control causes loyalty counters to be removed from them, regardless of whether Melira is on the battlefield.

If a creature with infect enters under an opponent's control after Melira enters, that creature loses infect.