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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 a creature the defending player controls can’t block the creature targeted by the last ability for any reason (such as being tapped), then it doesn’t block that creature. If there’s a cost associated with having a creature block the attacking creature, the defending player isn’t forced to pay that cost, so it doesn’t have to block in that case either.

Creature type alone isn’t always enough to tell you whether a creature has four legs or not. For example, leonin have only two legs, while tigers have four legs, but both are Cats.

Generally, you look at the art of a creature card to determine whether it has four legs or not.

If the creature is known to have more than four legs—say, it’s a spider—but not all its legs are visible, it still has four or more legs. It’s a legal target for either activated ability.

If there are multiple creatures in the art that each match what the card is representing, then that creature has four or more legs as long as any one of the matching creatures in the art has four or more legs. For example, Llanowar Elves (M19) has three figures in its art, all of whom are Llanowar elves. However, none of those figures has four or more legs, so Llanowar Elves is not a valid target for Jermane’s abilities. If even one of the figures had four or more legs, then the creature would be a valid target.

If there are multiple creatures in the art, only compare the one that represents the actual creature on the card. For example, Tarmogoyf (MMA) has the tarmogoyf itself and an elk in the art, and you need only consider the tarmogoyf.