stupid idea that just hit me,but wth,i'll share it
Divine/God tournament
each participants deck has to contain at least 3 copies of one of this cards(when possible)
Odin, Father of the Aesir
Thor, Lord of the Aesir
Loki, Lord of the Aesir
Uria, Lord of Searing Flames
Hamon, Lord of Striking Thunder
Raviel, Lord of Phantasms
The Wicked Dreadroot
The Wicked Eraser
The Wicked Avatar
Earthbound Immortal Uru
Earthbound Immortal Aslla piscu
Earthbound Immortal Cusillu
Earthbound Immortal Ccarayhua
Earthbound Immortal Ccapac Apu
Earthbound Immortal Chacu Challhua
Earthbound Immortal Wiraqocha Rasca
Exodia(in this case,only 1 copy of the 5 pieces are allowed)(the exodia deck as it is,is forbidden,but exodia decks like "Necros" or "Exodius" are allowed,as long as the deck isnt focused in drawing the 5 pieces of exodia)
at the end of the duel,the 3 copies of the selected card have to be shown to the opponent,the 3 cards minimum limit can be fulfilled by mixin them(ie:2xEI aslla piscu & 1xEI Ccarayhua )
the other restrictions should be decided by the tourney host