Wolfadeus Almighty

Flying, Protection from Nonlegendary
If an ability or spell from a nonlegendary source
would cause Wolfadeus Almighty to leave the battlefield, counter that ability or spell.
When Wolfadeus Almighty enters the battlefield,
you may tap target legendary creature. If you do,
it doesn't untap as long as Wolfadeus Almighty is
on the battlefield.
When Wolfadeus Almighty dies, deal 10 damage
to all creatures and planeswalkers.