No the attack would not happen because they would no longer have a monster in attack position to attack with.
Sounds like Ordeal of a Traveler. The effect is applied when the opponent attacks (does not have to be against a defence mode monster, or even a monster at all). He must select a card from your hand and correctly guess if it is a monster, spell or trap, or his attacking monster is returned to hand.
The following monsters inflict damage to your opponent when destroyed. Some of these effects will depend on whether you or your opponent destroyed it and/or if it was destroyed in battle or by a card effect:AbakiEarthbound Immortal Aslla piscuBalloon LizardMecha-Dog MarronOxygeddon
no it is not...
You do.
no
If this card attacks a defense position monster your opponent controls, destroy all defense position monsters your opponent controls after damage calculation. During your end phase, destroy all of your monsters that did not declare an attack this turn.
monster reborn
Assuming the defending monster is also in attack position, both monsters will be destroyed.
magic trap and monster
Five-Headed Dragon.
Unless the monster specifically says otherwise, it takes two tributes for a monster of Lv7+
yes its name is dark blade