Build decks you enjoy, keep your favorite cards safe, and let the market be the market while you have fun
Tap a black, a generic, and sac The Dross Pits to draw a card
Theres a ton of room for experimentation here (Exhaustion and Aetherize come to mind), and I dont want to presume to tell you what is best for your local metgame

Acclaimed Contender Allied Reinforcements Arthur, Marigold Knight Aryel, Knight of Windgrace Assure // Assemble Assure // Assemble Attended Knight Auriok Steelshaper Azorius Knight-Arbiter Balan, Wandering Knight Banish into Fable Barrow Witches Basri's Lieutenant Battle Menu Benalish Knight Blacklance Paragon Bladewing, Deathless Tyrant Blood-Cursed Knight Bloodsworn Knight Breathless Knight Brimstone Trebuchet Burning-Yard Trainer Cadaverous Knight Call the Bloodline Call the Cavalry Capashen Knight Chivalric Alliance Conclave Cavalier Conclave Guildmage Court of Embereth Craven Knight Crusading Knight Dark Knight's Greatsword Deathless Knight Diamond Knight Dion, Bahamut's Dominant Doom Foretold Dragonsoul Knight Dragoon's Lance Dub Elenda and Azor Errand of Duty Exsanguinator Cavalry Femeref Knight Fervent Champion Fireborn Knight Forth Eorlingas
And against a deck that happens to use a lot of artifacts and enchantments
9 Steel Sabotage In many ways, this Mirrodin Besieged common is a sort of upgraded iteration of Ceremonious Rejection