Aside from lacking a way to draw cards on his own, hes basically the whole package
While perhaps an interesting artistic choice, it matches the style used in the Pokmon Rumble game, which is where the illustration comes from
Inferno X, as the debut MEGA set, is positioned similarly to how Eevee Heroes performed the first of its kind premium
Gold is the more abundant currency, and will generally be earned by completing daily and weekly quests and filling out the battle pass (of which there is a free and premium version)
Furthermore, Leafeon is also very useful as a healer thanks to its second attack, Moss Agate
Sure, your opponent gets too as well, but if youre dropping a creature with an exceptionally powerful enter the battlefield trigger, like Atraxa, Grand Unifier, a creature that is practically unstoppable like Emrakul, the Aeons Torn, or an enchantment that gives you free rein to do whatever you like Omniscience, you basically guaranteed a win