Celestial Mantle attached to a creature you control without summoning sickness that cannot be blocked by an opponent.).
Steps
Deal combat damage to an opponent using the creature that has
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Celestial Mantle attached.
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Celestial Mantle triggers, doubling your life total.
If Sorin is on the battlefield as Sorin of House Markov, move to your postcombat main phase. Sorin of House Markov's second ability triggers, causing you to exile it and return it to the battlefield as Sorin, Ravenous Neonate.
Activate Sorin, Ravenous Neonate's second loyalty ability by removing a loyalty counter from it, dealing damage to target opponent equal to the life you gained this turn.