You arrange wars by challenging teams in their team topic threads or by privately contacting their representatives. When both parties agree to war, go to the Pending Wars section and make a topic (teamname vs teamname) containing the rosters, war format, card format (TCG, OCG, TCG + OCG).
What is implied as a TCG War:
TCG only cards are allowed, the TCG banlist is used.
What is implied as an OCG War:
Only TCG exclusives are not allowed. The OCG banlist is used.
What is implied as an TCG + OCG War:
All legal cards can be used. The TCG banlist is used.
What is implied as a TCG War:
TCG only cards are allowed, the TCG banlist is used.
What is implied as an OCG War:
Only TCG exclusives are not allowed. The OCG banlist is used.
What is implied as an TCG + OCG War:
All legal cards can be used. The TCG banlist is used.