The only issue is that pesky mana cost
you can play cards from the top of your deck with Falco Spara, PactweaverFalco Spara, Pactweaver, draw cards from The SwarmlordThe Swarmlord, make huge Hydras with Zaxara, the ExemplaryZaxara, the Exemplary, or dea damage with Shalai and HallarShalai and Hallar
4th Amethyst Steel Patrick Cote 1 Belle - Accomplished Mystic 3 Calhoun - Marine Sergeant 4 Chernabog's Followers - Creatures of Evil 4 Diablo - Obedient Raven 4 Doc - Bold Knight 4 Elsa - The Fifth Spirit 1 Friends On The Other Side 4 Genie - Wish Fulfilled 4 Madam Mim - Fox 4 Madam Mim - Snake 4 Magic Broom - Illuminary Keeper 3 Merlin - Crab 4 Merlin - Goat 4 Mr
So a card like that cost ten Chernabog
The stats aren't nothing either, as a 1/4 can block a lot of things
Basically, it doubles your chances with every coin flip, and thats the kind of thing thats going to supercharge your deck, and make it slightly less about luck, and slightly more about winning a lot