The steel ink type has three different locations, with the amount of locations in the other ink types varying
Essentially, if you have a full party with all four of these on the board, you can pay one white, one blue, and one black mana to give the Warrior lifelink, deathtouch, and make him unblockable (deathtouch and unblockable at the same time has no real use, but thats still OP to think about)
At the very least, the designers are at the top of their game here, with a slick, candy-colored art style for all the newcomers from Wreck-It Ralph
Bodyguard forces opposing challenging characters to target the card with this keyword, rather than any other character they might have otherwise had their eyes on
This gives you an opportunity to cause double damage, just like in the game
A little hype and scarcity goes a long way in helping cement the popularity of a game and ensuring its longevity