What does it mean that a character can’t use brave or stealth?

Basically, just ignore that the character has that ability when determining which character you’re attacking.

Source: Wizards of the Coast (2019-03-01)    【Link to Ruling】

Tags: Battlefield Scan

What is Brave?

Brave is a new keyword ability that helps some characters protect the rest of their team. When
choosing which enemy to attack, you must choose one with brave if possible.

Source: Wizards of the Coast (2019-03-01)    【Link to Ruling】

Tags: Brave

My opponent has two characters with brave that I could attack. What happens?

You choose one of them to attack.

Source: Wizards of the Coast (2019-03-01)    【Link to Ruling】

Tags: Brave

My opponent has one tapped character and one untapped character with brave. Do I have to
attack the one with brave?

No, and in fact you can’t even if you want to. Brave doesn’t override the rules for attacking
tapped/untapped characters. If your opponent has any tapped characters you must attack one
of them. If a tapped character had brave, you would have to attack that one if you could.

Source: Wizards of the Coast (2019-03-01)    【Link to Ruling】

Tags: Brave

What happens if two characters both have Brave? Do I get to pick out of the two, which receives the damage?

If two or more characters have Brave, the attacking player can choose between them.

Source: Wizards of the Coast (2019-10-11)    【Link to Ruling】

Tags: Brave

What is Stealth?

Stealth is a new keyword ability that lets some characters strike from the shadows without fear
of reprisal. When choosing which enemy to attack, you must attack a character without stealth
if able.

Source: Wizards of the Coast (2019-03-01)    【Link to Ruling】

Tags: Stealth

If my opponent has one tapped character with stealth, and the rest of their creatures are
untapped, which character can I attack?

Stealth doesn’t override the rules for attacking tapped/untapped characters. Since the
tapped character is the only one that can be attacked, that’s where your attack is headed.

Source: Wizards of the Coast (2019-03-01)    【Link to Ruling】

Tags: Stealth

What happens if a character has brave and stealth?

Brave and stealth essentially cancel each other out. You must attack that character if able,
and you must attack other characters if able. This basically means you must attack a character
you can attack, the same as if those abilities weren’t there.

Source: Wizards of the Coast (2019-03-01)    【Link to Ruling】

Tags: Stealth