Here that's very strong at killing your foes very quickly indeed
Since last Fridays big announcement, word on the Magic: The Gathering streets has been all about Tarkir: Dragonstorm
If this was for first-week Standard, then there would be a very good argument to put Felidar Guardian up at the top of the list, but there is a very real chance that the card wont be legal throughout its time in Standard
The explore mechanic pulls double duty in the deck and offers a repeatable source of card advantage, lands, and a way to build threats
As I often explain in my Budget Commander articles, every time I build a rough draft of a deck, I make sure I have a certain amount of mana, interaction, card advantage, etc