Sacrificial Center

When Sacrificial Center enter the battlefield,
each opponents chooses one: Target player
gains 3 Life or Prevent the next 3 damage to
target creature.
{t}: Add {r}.
When a creature you is sacrificed,put a blood
counter from Sacrificial Center. When there
are 3 counters on it, transform it into Blood-
Channeling Altarstone.
"Such scale!" - Vona