Davriel's Entity

All planeswalkers have all loyalty abilities of all
other planeswalkers on the battlefield.
Whenever a planeswalker enters the battlefield,
it's controller draws a card and discards a card and
put a soul counter on Davriel's Entity.
When Davriel's Enttiy has 7 or more soul
counters on it, you may sacrifice it. If you do,
return up to three legendary permanents on the battlefield to their owner's hand.