Siyavash, desert warden

When Siyavash, desert warden enters the battlefield create a 6/6 green legendary insect creature token named Pu Pu with trample and "whenever this creature attacks an opponent, that player sacrifices a nonland permanent or discards a card"
Whenever a creature or artifact an opponent controls is put into their graveyard from the battlefield, return it to the battlefield under your control. If it is a creature it is a 1/1 and a black zombie in addition to it's other types. If it is an artifact it gains "{t