I'm relatively new to magic and I've been enjoying all the various tribes/types/groups/themes you can build around. I like that you can build a cat deck or a dragon deck or a crab deck or an angel deck or a vehicle deck and all work with lots of options. What's your favourite theme and what are some of your favourite cards for that theme?
My all time favorite is sliver creatures, I find it so satisfying to see my army to gain so much strength at every piece entering the battlefield. Probably for the same reasons I love decks based on mutation mechanism, even if it's more fragile, since all power tends to concentrate on a single creature.