The eBay listing contains photos of all the cards in this lot
Like everything else on a cards type line, supertypes act as markers that can be referenced by other card effects (e.g., Target legendary permanent)
Or if you prefer the smaller, rampier parts of Green, theres the Packsong Pup: Of course, these would be plenty all on their own, but there are many multicolored cards unveiled this weekend as well, like the scuttling Vilespawn Spider: Or the Sigardian Paladin: If you want to ramp things up, green and white or green and blue seem to be pretty good combos
The main drawback to these strategies is that gaining life doesnt impact the board, which can lead to a bunch of dead draws
However, the difference lies in their keywords
From day one, players could risk their own Magic: The Gathering cards for a chance to win their opponent's