Trenaxx, the all knowing

Flying, indestructible, cascade
Protection from green
When Trenaxx leaves the field. Cast a card from your graveyard and or one from your exile pile free of mana cost. Then draw cards equal to the cost of the more expensive card.
Each time your opponent draws a card. You may pay {1} to either draw a card or add a +1/1 counter to a human creature you control.