Essentially with what my deck is I can easily do that. My deck is as close to AIDS incarnate as you can get as it is composed of nearly all cards that destroy monsters, so all I do is put them in defense position, let them die or get their flip effect, and then bleed my opponent out of his monsters.
anoymous
Destroy 3 monster
anoymous
If you kill your opponent with Bate Damage from destroying the 5th monster, it won't count. Make sure your opponent survives after having 5 of their monsters destroyed only then kill them.
anoymous
Destroy 5 monster
anoymous
How to Destroy 5 monster(s) in one Duel?
anoymous
If you kill your opponent with Bate Damage from destroying the 5th monster, it won't count. Make sure your opponent survives after having 5 of their monsters destroyed only then kill them.
anoymous
u fukin stall and keep attacking
anoymous
try and keep destroying more monsters in a duel and see if that helps, if it doesn't work then you can try contacting the support and see if it's a bug or not.