There a lot of decks right now, ranging from city vetruvian to aggro ziran (yes, this is now a thing). There are also things like vespyr kara (yes, im talking vespyr for a good 75% of the deck) and GM zendo decks. So yeah, a lot
As for abyssian… Swarm is officially dead. Ramp is still being tested… and it appears creep abyss is still the go to abyss decks, but they look expensive as hell, with things such as ghost azalea, klaxon and obliterate being all legendary (so a total of 8100 spirit).
As for magmar… Growmar is really fun to play. Spawn the moloki headhuntress with/and something else on board, and suddenly, hell is spread. Dont forget to add fractals as well for triple tilt action (nah, its actually decent as a 2 off) Eggmar I havent seen much of, but the one time i played against it, i got rekt because chrysalis burst, yes you are hearing this right, it STUPID good, since eggs now hatch at the beginning and things have rush ^^; As for starhorn… well… Smash_things has a zoo type starhorn but starhorn is still a mediocre general.
Hope this helped, and Good luck out there