The raw power and catch-all utility of its effect is easier to recur when attached to a cheap-ish creature, producing such huge results that non-white archetypes are trying to actively fit white mana into their decks to play it
This is why I am not a huge fan of Lightning Helix over Incinerate in agro decks, you are the deck life gain is good against and mirror matchups in cube are very rare
The fact that these are permanents, which can potentially be flickered, reanimated, or otherwise reused at low cost, makes these already flashy cards very strong
Maybe you get to play a couple Mountains, but certainly not many
6 Withengar Unbound Withengar Unbound is a terrifying and massive 13/13 legendary Demon with flying, intimidate, and trample
Naturally, the ultimate goal for most players is to flex the craziest,hardest-to-pull chase cards