Demon of Endless Revival

When Demon of Endless Revival enters the battlefield, create a legendary colourless artifact
called Summoning Mirror with shroud, indestructible and "Sacrifice a creature; put a
summon counter on this card, you lose one life".
Then, sacrifice Demon of Endless Revival unless
you escaped it.
Escape—{0}, Remove 5 summon counters from Summoning Mirror. (You may cast this card from
your graveyard for its escape cost.)