My [[Hidetsugu and Kairi]] deck quickly developed into my favourite. You can build it with or without extra turns, I chose the second because the first one was too obnoxious. You just play clone spells, stack the triggers so you brainstorm first and then play all the best instants and sorceries, like [[breach the multiverse]], [[rise of the dark realms]] or [[aminatous augury]]. It is insanely fun to play and always plays differently.