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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 permanent has protection from Rats, it means four things: 1) Damage from a source that’s a Rat that would be dealt to that permanent is prevented. 2) Auras and Equipment that are somehow Rats can’t be attached to that permanent. 3) Rats can’t block that permanent. 4) That permanent can’t be the target of abilities of Rats or spells that are somehow Rats.

Nothing other than the specified events is prevented or illegal. Hungry Lynx can’t block a Rat with the ability “This creature can’t be blocked,” for example.

The opponent who creates the Rat token is the owner of that token.

Hungry Lynx’s last ability puts a +1/+1 counter on each Cat you control, including itself.

If Hungry Lynx dies at the same time as a Rat, its ability triggers, but Hungry Lynx won't be on the battlefield as that ability resolves. It can’t be saved by the +1/+1 counter that would have been put on it. The same is true of any other Cats you control that die at the same time. Your remaining Cats will each get a +1/+1 counter.

Tokens that are sacrificed or destroyed are put into their owner’s graveyard before ceasing to exist. If the token was a Rat, Hungry Lynx’s last ability will trigger.