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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.

Because creatures you control enter as copies of Essence of the Wild, any "enters" triggered abilities printed on such creatures won't trigger.

If a creature such as Cryptoplasm that's already on the battlefield copies Essence of the Wild and modifies its own copy effect, that modification is also copied by creatures entering under your control.

External abilities may still affect how a creature enters. For example, if your opponent controls Urabrask the Hidden, which reads, in part, "Creatures your opponents control enter tapped," a creature entering under your control will be a tapped Essence of the Wild.

If a creature such as Clone is entering under your control, there will be two copy effects to apply: the creature's own and Essence of the Wild's. No matter what order these effects are applied, the creature will be a copy of Essence of the Wild when it enters.

Other "enters" replacement abilities printed on the creature entering won't be applied because the creature will already be Essence of the Wild at that point (and therefore it won't have those abilities). For example, a creature that normally enters tapped will enter as an untapped Essence of the Wild, and a creature that would normally enter with counters on it will enter as an Essence of the Wild with no counters.

Replacement effects that modify how a creature enters are applied in the following order: first control-changing effects (such as Gather Specimens), then copy effects (such as the abilities of Essence of the Wild and Clone), then all other effects. This is a minor rules change to make Essence of the Wild and similar cards in the future work intuitively.

If you control more than one Essence of the Wild, creatures you control will enter as a copy of the one whose copy effect you apply last.

Creatures you control don't copy whether Essence of the Wild is tapped or untapped, whether it has any counters on it or any Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, or so on.