Arek, False Goldwarden

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.
{3}{W}{B}, {T}, Sacrifice Arek: Target opponent loses X life and you gain X life, where X is Arek's intensity.