Omniscience [Best Game Ending Enchantment] Magic: The Gathering is largely defined by its mana economy
Blue also offers card advantage and makes for an interesting deck but with few cards to offer at all blue is never more than a splash
That means at higher rarities: Cloud, Midgar Mercenary Gilgamesh, Master-at-Arms Firion, Wild Rose Warrior (free 1/1s with job select) Freya Crescent Giott, King of the Dwarves Adelbert Steiner Zidane, Tantalus Thief is also an exceptional card, even without any direct synergy
Considering all physical variations, including foils, the total exceeds 100,000 collectible cards
Belle, Strange but Special 4
Since you have to cast something to trigger heroic, this should leave your hand card-neutral