Sevri, Soul Taker

Honor {b}{r} (As this creature enters the battlefield,
any opponent may pay its Honor cost. If a player
does, this creature enters the battlefield tapped.)
Flying, haste, indestructible
When Sevri, Soul Taker attacks, defending player sacrifices a creature. If they can't, put two +1/+1 counters on Sevri, Soul Taker.