Eren, Founder's Apostle

Whenever Eren, Founder's Apostle attacks, it
becomes a 10/10 Attack Titan with reach,
menace and trample until end of turn. Eren,
Founder's Apostle doesn't untap during your
next untap step.
If one or more Human creature tokens would
be created under your control, create that many
5/5 red and white Titan creature tokens with
trample.