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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 Myr Propagator has left the battlefield by the time its ability resolves, you’ll still put a token onto the battlefield. That token has the copiable values of the characteristics of Myr Propagator as it last existed on the battlefield.

Normally, when a token is created by this ability, it will simply be a Myr Propagator, so it’ll also have the token-creating ability. (See below for weird exceptions.)

Here are the weird exceptions promised above. If any copy effects have affected the Myr Propagator whose ability was activated, they’re taken into account when the token is created. For example: If Myr Propagator’s ability is activated, then Myr Propagator temporarily becomes a copy of another creature before its ability resolves (due to Cytoshape, perhaps), the token will be a copy of whatever creature the Myr Propagator is currently a copy of. After the turn ends, the Cytoshaped Myr Propagator reverts back to what it was, but the token will stay as it is. Also, if the copy ability of a creature (such as Cemetery Puca, perhaps) makes it become a copy of Myr Propagator and gain another ability, the token created by this creature’s ability will be a Myr Propagator with that additional ability.

Here’s the detailed version of what happens. As the token is created, it checks the printed values of the Myr Propagator it’s copying — or, if the Myr Propagator whose ability was activated was itself a token, the original characteristics of that token as stated by the effect that put it onto the battlefield — as well as any copy effects that have been applied to it. It won’t copy counters on the Myr Propagator, nor will it copy other effects that have changed Myr Propagator’s power, toughness, types, color, or so on.