highlander is a new format that has been going around forums the rules of a high Lander are simple:
you may only have 1 copy of any card in a deck
instead of drawing 5 card hand like normal you only draw 1 card
you can only hold 4 cards in your hand at a time
you can't use xzy monsters
other than those rules its a normal duel and its a lot of fun
if anyone would like to try it or wants to ask any questions about it dont be afraid to pm me