what are the most interesting / fun decks to play currently in tier1/tier2 ? Im fun of combo decks but they are not always that fun ...:P
And yea im returning to magic after 12 years and looking for a deck to play
So if you like the combat interaction in MTG I recommend "Bant Knightfall" and "Druid Vizier" as combo decks. When Plan A combo does not work you still have some okay creatures to finish your opponent off.
If you like pure combo decks then "Ad Nauseam", "UR Storm" and "Krark Clan Ironworks (KCI)" might be fore you. But I warn you, executing the combo from the last two takes some time and can bore your opponents to death.
If you want an aggressive deck that uses a lot of syngery but also needs some lucky rolls, then "BR Hollow One" can be something for you. Hope that helps!