Battlefield Duels
Step 1 Build a deck
Step 2 Search for 1 field spell and add it to your deck
Step 3 Duel using the rules of each player is allowed 1 field spell to be played and it must be played at the beginning of the duel.
The field spell is not counted towards the 40 card limit.
When you are playing the field spell both players have their own field spell active at the same time and you can destroy it at any time but it comes back next turn.
Your field spell only counts for your own cards, but not your opponent's cards and vice-versa.
You cannot destroy your opponent's field spell just like how your opponent cannot destroy your field spell.
You are not permitted to playing any other field spells during the course of the duel.
Cards that allow you to play field spells or add them to your hand are banned, like you would want to anyway.