"Banish-Wars" is a slang term used to describe Duels that involve Banish-oriented Decks which are often easy to abuse, as well decks themselves if they are easy to take high advantage in banishing causing opponent to lose their entire deck as a result. Single cards that banish are not considered as "Banish-wars" cards. The term was originally made by Chadook parodying the name of "Star Wars" in this manner.
Basically, Banish-Wars decks aim at banishing cards with effect, using "Necroface" at times to gain more advantage from cards being banished. Although some decks take partial advantage from Banish-wars decks/duels, some other decks get entirely crippled, unless they draw a card that restores banished cards. however, Banished cards face-down cannot be restored.
Banish-Wars Decks/Duels get too much of controversey of abusing cards in a manner of taking opponent's options entirely to the point that the opponent has nothing left to do, except scooping or desperate Set cards. Most of Banish-Wars Decks have too much advantages that cover their weakness.
List of Banish-Wars Decks: