Leopold of Vienna

Gains Hexproof while a Tentacle token is on the battlefield
When Leopold of Vienna enters the battlefield or
you cast a Instant or Scorrecry create a 1/4 Blue Tentical creature token with "{t}, Sacrifice this creature: Regenerate target creature (The next
time this creature would be destroyed thisturn, it isn't. Instead tap it, remove all damage from it, and remove
it from combat.)