Hungry Lynx — ruling 1

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.

Hungry Lynx — ruling 2

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.

Hungry Lynx — ruling 3

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

Hungry Lynx — ruling 4

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.

Hungry Lynx — ruling 5

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

Hungry Lynx — ruling 6

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.

Hungry Lynx : règles, fonctionnement et interactions (MTG)

Hungry Lynx is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Cats you control have protection from Rats. (They can't be blocked, targeted, or dealt damage by Rats.) At the beginning of your end step, target opponent creates a 1/1 black Rat creature token with deathtouch. Whenever a Rat dies, put a +1/+1 counter on each Cat you control.

How it works : Hungry Lynx

Original English text — Wizards of the Coast / Scryfall

#1August 25, 2017· Wizards of the Coast
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.
Card named in this ruling
Rat
#2August 25, 2017· Wizards of the Coast
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.
Card named in this ruling
Rat
#3August 25, 2017· Wizards of the Coast
The opponent who creates the Rat token is the owner of that token.
Card named in this ruling
Rat
#4August 25, 2017· Wizards of the Coast
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.
Card named in this ruling
Rat
#5August 25, 2017· Wizards of the Coast
Hungry Lynx’s last ability puts a +1/+1 counter on each Cat you control, including itself.
No other card is named in this ruling.
#6August 25, 2017· Wizards of the Coast
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.
Card named in this ruling
Rat