No. Slifer the Sky Dragon's Normal Summon can't be negated, and cards/effects cannot be used in response to its Normal Summon. However apart from that it has no other protection, it cannot negate anything.
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No, she doesn't 'negate' it. She protects your other face-up Lv3 or lower Zombies from being affected by Spells or Traps, but does not negate the effect itself.
Yes, Slifer and any other Egyptian God card can be destroyed by trap cards. More specifically, traps that don't target, like "Mirror Force", and traps that negate effects and destroy, like "Divine Wrath".
Well for one they can negate monster effects, spell and traps. It also has the effect whatever is on the card description.*although it sounds like the term is counting spells, it actually means "countering/counteracting spells" and would more correctly be "counter-spells."
Yes, "Mystical Space Typhoon" can not negate "Sakuresu Armor" and the rest of the cards mentioned. That is because there is a difference between negating and destroying. "Destroy" means to destroy a card and send it to the Graveyard. "Negate" means to prevent the card's effect from resolving. This is the best way to explain it: Since (most) Normal and Quick Spells, and Normal and Counter Traps don't have continuous effects, their effects still resolve. If a card's effect is considered continuous or requires it to stay on the field (such as Continuous, Equip and Field Spells, and Continuous Traps), when destroyed it's effect can no longer be active.
Really, only traps that negate his summon will work. That is because if his summon is negated, he never hits the field, and his continuous effect never 'switches on'.So Solemn Judgment, Horn of Heaven and Forced Back can all negate his summon. Note that since his effect is continuous and does not activate, you cannot use Divine Wrath or Gladiator Beast War Chariot.Secondly, if a Skill Drain is already active before he is summoned, when he hits the field, his trap negation effect will not switch on. Skill Drain will negate his effect, and other traps can be activated as normal.Lastly, his effect only works while he's on the field, so can be affected while he's in the hand, with cards like Trap Dustshoot.