Unatra, God Of The Dark Plane

When you cast Unatra, God Of The Dark Plane, {x} must be at least {1}.
Indestructible, Protection from white
Whenever Unatra, God Of The Dark Plane enters the battlefield or attacks choose one:
•Draw half x cards rounded down.
•Spiders, Birds, and Demons you control get +x-x and gain your choice of deathtouch or menace until end of turn.