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'Flying
Vigilance (Attacking doesn't cause this creature to tap.)
'This land enters tapped unless you control two or fewer other lands.
{T}: Add {G} or {U}.
'Sacrifice this creature: The next time a source of your choice would deal damage to any target this turn, prevent that damage.
'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.