The ability to exile and return one of your creatures to the battlefield is of great value for creatures that have enter-the-battlefield effects
If your collection is under a thousand cards, perhaps you want to store it in one of the new Holiday Gift Boxes (available at CoolStuffInc.com for only $19.99!)
Odds are that Gleeful Arsonist will do at least some damage if it lasts into the late game when everyone is trying to cast kill spells on opposing commanders, so prepare to get some good value out of this little firebug
Collector Boosters are the best way to collect variant rares and mythic rares, as well as foil cards, and they're the only place to collect foil-etched, extended-art, and neon ink cards
You may also be able to go off with summons, as making one into a mutant and then untapping with it draws you a bunch of cards
The saurids revere it, feeding it their great leaders upon their deaths and charting its migrations as a passing of eras