Good old MTG, admittedly I only ever played it in digital form, but there I played a lot.
- in Zendicar block/inistrad I had a fun red/green landfall deck. There was a legendary elf that allowed you to play 2 lands/turn, an equipment to return lands back to your hand, enchantments with landfall events, creatures that got bigger with every land, etc. It was slow, but very satisfying. Efficient small aggro creatures just aren't fun for me. An dlet's not forget the green insistrad human that got you a clues and grew bigger every landfall
- Superfriends! It was degenerate and not that good, but it was a lot of fun, and that's what it's about in the end anyway. In Magic Duels I had every planeswalker, so I made a 5 color deck, like a 3rd or 34th of it was just planeswalkers, the rest protection, cheap ramp/color fixing and oath enchantments. Once you get rolling you just tick out of control, but usually you die before you can do much
- constrictor +1/+1 counters. Very fun, and as I later learned even a big meta concept. It revolves around a cute 2 drop green/black 2/3 snake that added to every +1/+1 counter you place one more. The deck builds itself and it's just so satisfying seeing your snake's minions grow