no
Assuming the defending monster is also in attack position, both monsters will be destroyed.
Forbidden Chalice will negate Marshamallon's 'cannot be destroyed by battle' effect. Because Forbidden Chalice changes the ATK of a monster, it can be used in the Damage Step, after Marshmallon is flipped by an attack. If you did this, you will not take the 1000 damage from Marshmallon either - his damage dealing effect activates after Damage Calculation, but will be negated.
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Waboku will reduce all Battle Damage to your Life Points to zero and/ or prevent your Monsters from being destroyed by battle for the turn it is activated. So yes, the first scenario you described is what will occur if you play Waboku.
Yes.
no
yes but the damage from the first attack doesnt add on to the second attack
Alexandrite Dragon is strongest.
You do.
Yes, this is what you normally do since you can't place them in face down attack position.
other yugioh cards monster the higher attack points the better
Assuming the defending monster is also in attack position, both monsters will be destroyed.
Forbidden Chalice will negate Marshamallon's 'cannot be destroyed by battle' effect. Because Forbidden Chalice changes the ATK of a monster, it can be used in the Damage Step, after Marshmallon is flipped by an attack. If you did this, you will not take the 1000 damage from Marshmallon either - his damage dealing effect activates after Damage Calculation, but will be negated.
Almost. It's text clearly states that it "negate(s) the effect of all spell cards on the field". So as long as it's a spell card active on the field, it is no good. Some cards, however, activate when they are sent to the graveyard, but those are rare. but if u use the effect of destiny hero diamond dude then silent sworsman cant negate it
because he payed life of the effect of power bond 4000 cyber end dragon attack points