Ok heres my Genkai Deck (aprx. 70):
You can skip the itemized deck list if you want, i have the basic strategy afterwards.

Fighters:
1) M1
2) Yuu Kaitou (taboo master)
3) Mitsunari Yanagisawa (copy master)
4) Asato Kido (shadow master)
5) Either Ruka (2) or Genkai the Young (1)

Techs (19):
Desperate Assault(2)
Desperate Temper (2)
Rainbow Cyclone (2)
Power Smack (2)
Spirit Shield (3)
Death Tree (1)
Yuu Kaitous Territory (2)
Asato Kidos Territory (3)
Copy Masters Territory (2)

Events (28)
Time Out (3)
Botan's Healing (1)
Final Gift(1)
Empowered Emotions(1)
Efflux(3)
Zenith of Fear (3)
Flashback (2)
Party Time (1)
Entrapment(3)
Surprise Attack (2)
Driven By Animosity (2)
Reliving the Past(2)
Falling Apart(3)
Confrontation (1)

Items(19)
Key (3)
Microphone (3)
Walking Stick (3)
Death Tree (3)
Fishing Pole (2)
Koenma's Gavel (2)
Backyard Dummy (1)
Captured Souls (1)
Souls (1)

Ok now that that tedium is over, heres my stradegy. I generally throw the first match with M1 so that i can use reliving the past just in case to attack twice later on. If i have an opening to kill them in one turn i'll do it though. With yuu kaitou, i stall for a while so that i can choose words in the name of the same card and kill them in one turn, also allowing my oppenent to gain cards. Next with the copy master i'll attack with confusion with his territory out, since my oppenent has a lot of left over cards from yuu kaitou he will not attack to avoid attacking his sideline. With Asato Kido i use rainbow cyclone and his territory to kill em that way. If my oppenent has a strong 5th character (yusuke unleashed) i'll use ruka with death tree, or if i feel comfortable with my opponent's fifth i'll use Genkai the Young because shes cool and the leader of the team anyway (different Genkai i know but i still like her XD). And thats it.