In a very strict technical sense, Raise the Alarm adds two creatures to the battlefield, and should therefore be considered two-for-one card advantage
What makes this card a homerun is the reverse side: Explore the Vastlands is a group hug card, and it can catch up the players who are having a rough game
You may want to save it for later turns where you'll have mana to cast the card you exile, or you might want to see all your options first before making your move
You need to find it early enough to protect your Goodra, it can be removed by Lost Vacuum, and even if it sticks in play, the opponent can KO Goodra with Lugia, then use Yveltal to KO the second Goodra VSTAR later in the game
I had a very terrible starting hand, but I was able to hang on by a thread with healing combos for long enough to almost make a comeback