In terms of amount of play City is pretty comfortably at the top of this list
By handing out card draws, opponents will see you as a useful asset, often overlooking that youre powering up your forces with +1/+1 counters and flying, and drawing even more for yourself besides
Absolute Virtue Aettir and Priwen Clive, Ifrit's Dominant Cloud, Midgar Mercenary Cloud, Planet's Champion Emet-Selch, Unsundered Esper Terra Gogo, Master of Mimicry Hades, Sorcerer of Eld Ifrit, Warden of Inferno Kefka, Court Mage Kefka, Ruler of Ruin Lightning, Army of One Sephiroth, Fabled SOLDIER Sephiroth, One-Winged Angel Sephiroth, Planet's Heir Terra, Magical Adept Vivi Ornitier Y'shtola Rhul Yuna, Hope of Spira
Electro, Assaulting Battery lets you bank any extra red mana (I virtually never have any extra ), but the clock is on until Electro can blast an opponent