Each column has cards the others can't play (no red Warstorm SurgeWarstorm Surge in a blue-green Tatyova deck, for example)
2 Cursed Melfolk (Ursulas Handiwork) No Strength, No Problem Not every card in your deck needs to be expensive
Then Wizards started giving us 3-mana creatures that also let us discard and draw, like Tersa Lightshatter and Kiora, the Rising Tide
We buy over 600,000 cards and sell over 400,000 cards (thats non-bulk cards) a year
Midgar is probably the best, because when you cant muck about with the spell, its the land
Sunfall Formerly the king of sweepers in Standard, Sunfall obliterates the board while leaving you with a decent threat