Insane

Serra Avatar's power and toughness are each equal to your life total. When Serra Avatar is put into a graveyard from anywhere, shuffle it into its owner's library.

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.) Whenever enchanted creature deals damage, you gain that much life.

Equipped creature can't be blocked and has shroud. (It can't be the target of spells or abilities.) Equip

Vigilance When this creature enters, each player's life total becomes the highest life total among all players.

Enchant creature Enchanted creature gets +3/+3. Whenever enchanted creature deals combat damage to a player, double its controller's life total.