how do battle siege cards work mtg Top 10 in Magic: The Gathering Invasion of Ikoria | March

In my artifact decks, Ill play as many of these as I can get

On this card, we see a depiction of Avenger's Tower

In this case, because your life total also can't change, that damage has any other effects that it may have aside from causing you to lose that much life (such as effects from lifelink or infect) and triggers and effects can see that damage was dealt even though your life total didn't change

1Devilish Valet

Like other permanent spells, you can only cast it during your main phase when the stack is empty, i.e., when you could normally cast a sorcery

Its unfortunate because his blue mage ability of learning skills would come in handy