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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.

Players can respond to the activation of the last ability, but not after players know what effect is going to happen.

AskUrza.com, the web site that powers Urza, Academy Headmaster, has expanded to support Urza's Fun House. On that site you'll find a button that says "ENTER THE FUN HOUSE." As the last ability resolves, click it and find out what you paid seven mana for!

The Urza's Mine, Urza's Power-Plant, and Urza's Tower required to activate the middle ability needn't be three separate permanents. If you happen to control a land that has those four land types (or perhaps one that has all land types . . . you know . . . glances up . . . it's a different card in this . . . Nearby Planet!), you can activate the ability.

Once you have infinite colorless mana, it doesn't matter how much mana you spend, you will still have infinite colorless mana. You will, however, lose infinite unspent mana as that step or phase ends.

The mana added by the middle ability is colorless mana.

You can do a lot of cool stuff with infinite mana. And some situations may not be obvious. Rather than rehash everything ad infinitum, perhaps the Gatherer rulings on Infinity Elemental will help.

If an effect comes up that requires a target and there are legal targets available, you must use that effect even though you may not want to. However, the effects are all good for you or bad for your opponent. In some cases, you may not be able to take advantage. For example, if it ends up that creatures you control get +3/+3 until end of turn but you don't control any creatures, you're out of luck. But nothing bad will happen.

The middle ability can be activated only once. Not once per turn. Once. Okay, maybe more times. If Urza's Fun House leaves the battlefield and returns, it's a new object, so you can activate it again. You know, in case INFINITE MANA wasn't enough the first time.

The last ability works a little differently with respect to targeting. Unlike other abilities, you may have to choose targets while that ability is resolving. If the effect that comes up requires a target and there are no legal targets available, click again until that's not true.