At the beginning of your upkeep, you may look at the top five cards of your library
Its got the swirling energy bits associated with morphs and manifests from the original Tarkir block, and an overall cool blue pallet befitting of the spirit dragon himself
That permanent gains haste, "When this permanent leaves the battlefield, it deals damage equal to its mana value to each creature," and "At the beginning of your end step, sacrifice this permanent." If a permanent has in its mana cost, X is 0 for the purpose of determining its mana value
If there are multiple Runed Terrors on the battlefield, their abilities are mercifully redundant
The purpose of collector boosters is to offer a premium product for players who want to open something with fancier cards than draft, play, or set boosters without waiting for a Masters product or something similar to come out