Coffeeling
Member
That's... that's almost exactly what Warchiefs do, except power/toughness in the deck don't matter except for search effects (and some grant special/keyword abilities instead of stat increases or have their own abilities). But there are some that do almost exactly what that card does - Undead Warchief and Daru Warchief, in particular.
http://gatherer.wizards.com/Pages/Search/Default.aspx?name=+[warchief]
Uh, it's not at all what Warchiefs do. The Hex card doesn't affect cards in play, tokens in play, cards in your hand. The cards' stats in decks can easily matter - see Wild Pair for example:
It's very different from a Warchief. The Hex card could probably be recreated in MTG by making a sorcery that creates an emblem, but even then the wording would be horrendously clunky, and I'm not even sure if it could be made to work. You'd probably have to rewrite some basic rules definitions to be able to clone the card in Magic.