Thanatos, Trainee of Darwin

Flying
When Thanatos, Trainee of Darwin enters the battlefield, Vampires you control on your battlefield gain +1/+1 until end of turn. Target opponents lose 1 life.
{8}{b}: Choose 1 of the following:
• Sacrifice half (rounded-up) non-land
permanents on opponents battlefield.
• Target opponent discards their hand and
draws 5 cards