[[Arek, False Goldwarden]] sacrifice ability didn't drain the target even though it's intensity increased
#Arek, False Goldwarden
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Legendary Creature — Human Cleric
Starting intensity 0
Whenever another creature enters the battlefield under your control, perpetually increase the intensity of Arek and the intensity of all cards named Arek, False Goldwarden in your graveyard, hand, and library by 1.
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, Sacrifice Arek: Target opponent loses X life and you gain X life, where X is Arek's intensity.
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