When this creature dies, if it had one or more -1/-1 counters on it, its owner draws that many cards and each other player loses that much life
By the way, if it comes down to it, a beefed-up 3/2 with vigilance can get the job done in combat as well
If thats another creature, it also gains the non-backup abilities of this creature printed below this one until end of turn. Cards with backup have one or more abilities printed after the backup ability
Collector booster contents vary wildly between sets, so heres what you can expect from a Final Fantasy collector booster as an example: 3 foil commons 3 foil uncommons 1 foil basic land 1 non-foil showcase art uncommon 1 foil showcase art common or uncommon 3 non-foil rares or mythic rares with Booster Fun 1 card from the Through the Ages bonus sheet 1 foil rare or mythic rare that could be a colorful chocobo or a serialized gold chocobo
If you have the right burn payoffs, this could be a nice piece of the puzzle, plus then you can pitch it to your other spells as needed