Somniphobe's Fiend

When Somniphobe's Fiend enters the battlefield,
tap each of your lands and creatures.
Skip your next untap step.
You and creatures you control have hexproof.
When Nightmare Fiend leaves the battlefield,
exile it. Take extra turn after your next end step.
"I was not asking. You will submit. And I will teach
you all I know." La Sa'ash to Bufug Paqat