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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.

Creatures you control that have been dealt lethal damage remain on the battlefield. (704.5g)

A creature with toughness 0 or less can still attack and block. If it blocks an attacking creature with trample, treat its toughness as 0 when determining how to assign combat damage.

Equipment and Fortifications you control can stay attached to an illegal permanent. (704.5n)

Battles you control with no player in the game designated as their protector do not get a new protector. In this state, they'll be impossible to attack. Even Rules Lawyer has weaknesses. (704.5w)

Battles you control with no defense counters aren't put into their owners' graveyards. Given the intrinsic ability of Sieges (310.11b), this is unlikely to come up often. (704.5v)

Auras you control stay on the battlefield if they're attached to an illegal permanent or if they aren't attached to a permanent (but should be). They may not do much because there probably won't be an "enchanted [whatever]," but they'll stay on the battlefield! (704.5m) Similarly, thanks to an unlisted silver-bordered state-based action no longer applying, your creatures with augment can now survive even if not attached to a host. If this happens, its power and toughness are 0/0. (704.5m)

Because Rules Lawyer applies only to you and other permanents you control, tokens that leave the battlefield will continue to cease to exist. This is also true for copies of cards that might exist off the battlefield.

Creatures you control with toughness of 0 or less remain on the battlefield. (704.5f)

You can control as many legendary permanents (including planeswalkers) with the same name as you want. It's like your own personal Mirror Gallery! (704.5j)

You won't choose sector designations for creatures that don't already have them if a permanent with space sculptor is on the battlefield. If this comes up, it'll be a true galaxy brain moment. (704.5u)

Rules Lawyer's ability doesn't apply to itself. It can die for any number of reasons. If you're at 0 or less life and you lose control of Rules Lawyer, you'll immediately lose the game.

In Commander, you're immune to the "commander damage rule" that says you lose if a single commander deals 21 or more combat damage to you. (704.6d)

Your planeswalkers remain on the battlefield even if they have no loyalty counters. (704.5i)

You can control multiple permanents with the supertype world. So, that opens up some deck ideas, I'd imagine. (704.5k)

While you control Rules Lawyer, the following is true, with the exception of not affecting Rules Lawyer itself (Comprehensive Rules references as of this writing in parentheses; check out all of 704.5 and 704.6 for anything that's been added, changed, or moved since then):

If you somehow control a battle or creature that's attached to another permanent, that battle or creature can stay attached. If it's a creature, it can attack and block, even if another creature is carrying it. Similarly, if you control a permanent that isn't an Aura, an Equipment, or a Fortification, it can stay attached to whatever you manage to get it attached to. Strange. (704.5p)

Your Two-Headed Giant team can no longer lose because you have 0 or less life or fifteen or more poison counters. (704.6as and 704.6b)

If you try to draw from an empty library, nothing happens. (704.5b)

+1/+1 counters and -1/-1 counters on permanents you control no longer annihilate each other. (704.5q)

Creatures you control shrug off opposing creatures with deathtouch. (704.5h)

Planeswalkers with no loyalty counters and battles with no defense counters can still be attacked. Hopefully your opponents think this sounds fun and cool.

Creatures can have as many Roles you control as you want attached to them. The casting director's job has never been easier. (704.5y)

Any ability that says a player wins or loses the game still works.

Good news for Rasputin Dreamweaver fans: you can ignore abilities of permanents you control that say it can't have more than a certain number of a certain kind of counter. (704.5r)

You could hit up an all-you-can-eat poison counter buffet no problem. (704.5c)

You don't lose the game if you're at or below 0 life. (704.5a)

If you control a Siege and you're also its protector, you'll continue to be its protector. Good luck attacking it. (704.5x)

Sagas you control aren't sacrificed when they have more lore counters than chapter abilities, even if their final chapter ability isn't on the stack. Have fun stacking up lore counters! (704.5s)