#dumbellsndragons

706.2 When copying an object, the copy acquires the copiable values of the original object’s characteristics and, for an object on the stack, choices made when casting or activating it (mode, targets, the value of X, whether it was kicked, how it will affect multiple targets, and so on). The “copiable values” are the values derived from the text printed on the object (that text being name, mana cost, color indicator, card type, subtype, supertype, rules text, power, toughness, and/or loyalty), as modified by other copy effects, by its face-down status, and by “as . . . enters the battlefield” and “as . . . is turned face up” abilities that set power and toughness (and may also set additional characteristics). Other effects (including type-changing and text-changing effects), status, and counters are not copied.

Just one.

Even though you share a life total with your teammate in 2HG, you both gain and lose life separately with the result applied to the shared life total. Your teammate gaining or losing life won’t trigger Lich’s Mastery.

A few other notes on 2HG and Lich’s Mastery:

Hexproof only applies to your opponents. Your teammate can target Lich’s Mastery if they want to.

As long as you control Lich’s Mastery, your teammate can’t lose the game either.

When combat damage is dealt to your team, the creature’s controller chooses which member of your team the damage is dealt to. They probably want to deal it to the player with Lich’s Mastery.

Enrage abilities don’t care about sources of damage, they care about instances of damage. All combat damage that’s dealt in the same combat damage step is dealt simultaneously. A creature that’s blocked by or blocking multiple creatures is only dealt damage once even though it’s being dealt damage by two different creatures.

Yes.

Any ability that triggers at the beginning of your postcombat main phase will trigger at the beginning of each postcombat main phase if there are multiple combat phases in the turn.

Assuming that you targeted that opponent with Skullcrack, then Skullcrack will deal 3 damage to Empyrial Archangel. Additionally, damage won’t be able to be prevented this turn and players won’t be able to gain life this turn.

Empyrial Archangel’s redirection ability, like all redirection abilities, isn’t a damage prevention effect. Redirection abilties don’t prevent damage, but rather cause it to be dealt to something else instead of its intended “target”.

A static ability is any ability of a permanent that’s not an activated ability or triggered ability. Any ability of a permanent that doesn’t use the stack is a static ability. e.g. Flying