You always get a rare or mythic rare that is a card with the showcase fang treatment, a showcase eternal night legend, a borderless dual land, a borderless planeswalker card, or a Dracula series card
It's a 3/3 flier for that has itself and other spirits you control phase out whenever they become the target of a spell
Also, you can crank up the Creativity to really let Urzas AI run wild
The Pack Dust crafting system lets every pulled card contribute set-specific dust (Common 1 Crystal 50, +50% on duplicates) toward guaranteed acquisition of any missing card from that same set endgame pity that doesn't break the per-pack economy
Whats more, its an asymmetrical effect, which means theres virtually no opportunity cost to including him
Bruse does not need to stay on the battlefield to matter, since one attack can swing life totals dramatically