Well EDH is a hundred card deck. YOu need a leader which can be any legrendy creature. You can only use the colours in his/her cost. Your only aloud one copy of each card. You have 40 life however if you dealt 20 damage buy the leader you die. The leader remains out of play and you can play him wenever you can afford him. If your leader dies he is removed and can be played again for one extra mana. So if your leader cost one and he has died twice he cost three. I want to know if you can include cokours that are in a leaders ability. So if you have a blue/green creature, with a ability that requires red...can you use red?