It means you can get Excalibur, Sword of Eden down quicker, and it means you can turn a Loran of the Third Path or Boromir, Warden of the Tower into a cheeky one mana play while deploying something bigger and scarier
Gamers can get a lot of awesome cards without ever needing to spend a penny
Their Normal Summon can't be negated and nothing to activate in response to their Normal Summon
The modes are quite different from each other, too, but giving your whole team hexproof, while maybe slightly over the top as most spells only target a single creature, is a good bit better than just giving hexproof to one of them
Last but not least, the design of a card can also influence its popularity
Access app, a code good for two Elite Fast TMs, two Elite Charged TMs, Fast and Charged TMs, and 100,000 Stardust in Pokmon GO, and more to be announced at a later date