Cards like Jirina, Dauntless General and Sigarda, Font of Blessings offer extra advantages for sticking to the type
Gramma Tala, Spirit of the Ocean is a seven-cost card that has excellent stats: with four willpower, a whopping eight health and the option to quest for two lore
Emet-Selch, Unsundered* An early game looter and body with vigilance, gives way to a mid-late game card advantage engine and finisher threat, making it one of the best in the set
To make it into the Top 10, a card had to be broadly useful
Lost In Thought (Odyssey/Torment/Judgment) Back in Mirage , Wizards created a removal spell for white called Pacifism
While it might be hard to use earlier in the game, you can always just ink Yzma or use her to quest a little until you start emptying your hand