My two favorite formats to play are Legacy & Limited. As a casual player, I have little interest in having my decks become obsolete as sets are rotated in and out. Block Constructed lets me use my limited cards and create something at a minimum additional cost. I also don't play that often with my physical cards. But when I do, I usually play with people who spend far less money than me. I'll gladly play one of my Block Constructed decks against their Legacy decks.
The following decks are listed in reverse chronological order: