Of course, his card being enchanted in rarity helps that a lot, but he's also a valuable card that can halt your opponent's progress and win you the game
There are other ways to draw a lot of cards with white, but I'm partial to the enchantress strategy, which in my opinion is some of the best card draw in the game, let alone for mono-white decks
Of course why wouldnt we want that here
Amber and Amethyst likes to quest early and often. Emerald and Ruby is especially good at delaying your opponents progress early on. Sapphire and Steel is great at quickly increasing the amount of ink in your inkwell. Those descriptions from the quick-start rules for each deck proved true
TISHANAS TIDEBINDER Tishanas Tidebinder has some scary-good rules text
The Good Currently bugged on Magic Online (so it reduces mana costs by two of any combination of black, red or generic mana), which makes it way more powerful than it should be (for example, we can cast a Fanatic of Mogis for free with two copies of Ragemonger on the battlefield)