Silent Hallcreeper copies exactly what was printed on the target creature and nothing else (unless that creature is copying something else or is a token
Suki, Courageous Rescuer Suki, Courageous Rescuer looks solid enough, though its easily outclassed by Cosmogrand Zenith unless the ally typing really matters (and even then, probably)
For the purposes of playing, they are equivalent to one another (that is, you can still only play a maximum of 4 copies in a deck no matter if you are playing the Godzilla Series or Ikoria versions)
Even at two life and a creature, Razaketh, the Foulblooded setting you up for something broken
For each 1 damage prevented this way, create a 2/1 white and black Inkling creature token with flying
Most serialized cards are also Multiverse Legends cards, though there are a few serialized versions of new cards from March of the Machine