Slifer vs Black Mist question (as well as ? monster overall) (solved)

Since slifer gains all of its attack and def from the player's hand, would I be able to cut its attack in half with Black Mist's effect or would black mist's effect not work properly because of how slifer gains its attack power?
What I mean is, is the attack equal to the ammount of cards in the players hand a constant thing no matter what, or can slifer's attack be altered just like any other monster? if it can be cut, will it go back to normal the next time the play draws a card? (slifer is cut in half at 1k, but next turn they jump back up to 3k cause the player has 3 cards in their hand?)

Does this kind of thing apply with all ? attack creatures or only ones that get their effects from "'X' ammount of cards in whatever place"

also, does shrink work as well?

Black Mist can still activate and gain half of the current ATK of Slifer, and Slifer ATK will stay half for the rest of the duel (unless it leaves the field or Flipped face-down)

Konami wrote:If the ATK & DEF of "Tragoedia" are halved by the effect of "Elemental HERO Great Tornado", then its ATK & DEF will remain at the halved value, even if the number of cards in its controller's hand changes afterwards.

Replace Tragoedia with Slifer and Great Tornado with Black Mist.

As for Shrink:

Konami wrote:The Winged Dragon of Ra: "The Winged Dragon of Ra" has "?" ATK, which is treated as 0 when interacting with a resolving "Shrink".
Example: "The Winged Dragon of Ra" has 6000 ATK by its own effect. If "Shrink" targets "The Winged Dragon of Ra", then its Original ATK of 0 is halved, and then you re-apply its ATK-increasing effect, so that its ATK becomes 6000.

Final conclusion: Slifer's ATK will be halved (based on the cards in the hand) and not reset for effects like Black Mist. For effects like Shrink, which only modify original ATK, Slifer will retain its full ATK power based on the cards in the hand.

Only 1 monster with ? ATK can retain its ATK at full in those situations is The Wicked Avatar.

zekana wrote:Since slifer gains all of its attack and def from the player's hand, would I be able to cut its attack in half with Black Mist's effect or would black mist's effect not work properly because of how slifer gains its attack power?
What I mean is, is the attack equal to the ammount of cards in the players hand a constant thing no matter what, or can slifer's attack be altered just like any other monster? if it can be cut, will it go back to normal the next time the play draws a card? (slifer is cut in half at 1k, but next turn they jump back up to 3k cause the player has 3 cards in their hand?)

Does this kind of thing apply with all ? attack creatures or only ones that get their effects from "'X' ammount of cards in whatever place"

also, does shrink work as well?

so more clearly, if you have 4 ards in your hand and slifers attack is cut in half to 2k attack, it will remain at 2k attack regardless of how many cards you have in your hand

No, it will remain at half value, not at 2000, like when you have 4 cards in hand, Slifer's ATK stays at 2000, 5 cards in hand, ATK at 2500, 6 cards in hand, ATK at 3000, .... Get it?

when attacked with 4 cards in the hand it will be cut to 2000 and it will stay forever at 2000. I don't see why this should work differently from Gale

Oh, I thought the ATK can still be modified at half value.

Black Mist halves the atk permanently, thus it will stay at half of its attack until it's flipped face-down or removed from the field

Consider Slifer to be a God, it still sucks at some points, so as far as we know, The Wicked Avatar is the only 1 with ? ATK that won't be affected by Black Mist or Gale or anything like that. (actually still affected but its effect will re-apply immediately to boost its ATK up again, and of course not taking about those that can't be affected by effects too)