This year, Wizards of the Coast is leaning hard into Universes Beyond sets, with Final Fantasy the first of three sets this year which leans on established franchises outside of the companys own characters and settings, followed up by Spider-Man and Avatar: The Last Airbender last in the year
Having an average of 25 creatures is enough that you can run at least 37 to 38 lands and still have enough protection, ramp, tutors, graveyard recursion, and removal spells to be ready for any curve balls that come up in the game
While tribal decks, decks based around the use of a specific creature type, are known for their synergies, each tribe has its own distinct strengths
Ghost-Spider will only burn the player it is attacking, but still counts all attacking creatures for its effect, even if they are attacking someone else
If you're in that position you have a wide variety of ways to close it out so again I think it could use some testing
"The alien-like nature of some of our deep-sea creatures inspires the concepts of alien life surviving in different atmospheres." In fact, there are animals like the " water bear ", which survived the vacuum and radiation of space." Earth is plenty weird, so it's not a stretch to think of even weirder creatures living elsewhere