Aramist, Altered by Alchemy

When Aramist, Altered by Alchemy enters the battlefield, create X Blood tokens.
{2}, Sacrifice a Blood token: Choose one—
•Tap target creature an opponent controls. It
doesn't untap during its controller's next untap
step.
•Add {b}{b}{b} to your mana pool.
•Aramist deals 3 damage to any target.