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 At the beginning of your upkeep, sacrifice Serra Bestiary unless you pay {W}{W}. Enchanted creature can't attack or block, and its activated abilities with {T} in their costs can't be activated.
"I was there when Phyrexia doomed Serra's realm with a single touch. I was there when Yawgmoth tried and failed to conquer Dominaria. And I will still be here when Elesh Norn lies dead."
Flying Once during each of your turns, you may play a land from your graveyard or cast a permanent spell with mana value 3 or less from your graveyard. If you do, it gains "When this permanent is put into a graveyard from the battlefield, exile it and you gain 2 life."
"The humans are useful in their way, but they must be commanded as the builder commands the stone. Be soft with them, and they will become soft." —Radiant, archangel
[+2]: Creatures you control with flying get +1/+1 until end of turn. [–3]: Create a 4/4 white Angel creature token with flying and vigilance. [–6]: You get an emblem with "If you control a creature, damage that would reduce your life total to less than 1 reduces it to 1 instead."
At the beginning of your upkeep, you may put a verse counter on Serra's Hymn. Sacrifice Serra's Hymn: Prevent the next X damage that would be dealt this turn to any number of targets, divided as you choose, where X is the number of verse counters on Serra's Hymn.
At the beginning of your upkeep, you may put a verse counter on Serra's Liturgy. {W}, Sacrifice Serra's Liturgy: Destroy up to X target artifacts and/or enchantments, where X is the number of verse counters on Serra's Liturgy.
Serrated Arrows enters the battlefield with three arrowhead counters on it. At the beginning of your upkeep, if there are no arrowhead counters on Serrated Arrows, sacrifice it. {T}, Remove an arrowhead counter from Serrated Arrows: Put a -1/-1 counter on target creature.