connected Leader damage takes the top one into your hand
The math is all wrong on this trooper
A few I can think of off the top of my head are Rogues, Zombies, and Faeries
Imagine running Massacre Girl, Known Killer and just drawing dozens of cards when she hits the battlefield
In looking over the deck lists, one of the decks in particular jumped out at me as being particularly synergistic and primed for easy upgrades
Absolute Virtue Adelbert Steiner Aerith Gainsborough Ambrosia Whiteheart Ashe, Princess of Dalmasca Bahamut, Warden of Light Beatrix, Loyal General Cecil, Redeemed Paladin Choco, Seeker of Paradise Cid, Timeless Artificer Cloud, Midgar Mercenary Cloud, Planet's Champion Crystallized Serah Dion, Bahamut's Dominant G'raha Tia Garnet, Princess of Alexandria Giott, King of the Dwarves Hope Estheim Hydaelyn, the Mothercrystal Joshua, Phoenix's Dominant Judge Magister Gabranth Lightning, Army of One Minwu, White Mage Noctis, Prince of Lucis Phoenix, Warden of Fire Rinoa Heartilly Rosa, Resolute White Mage Rufus Shinra Serah Farron Snow Villiers Squall, SeeD Mercenary Stiltzkin, Moogle Merchant The Wind Crystal Tidus, Blitzball Star Venat, Heart of Hydaelyn Yuna, Hope of Spira Zack Fair Zidane, Tantalus Thief