Not only does he have a "big butt", his ability heals himself
It fits well in midrange or defensive Naya builds that want to dominate combat
Again, limited by time, you spend Wonder Hourglasses to recover wonder stamina for essentially a game of lucky pick: you select a group of five cards on offer, they're shuffled up in a whirl, follow-the-cup magic trick style, and you pick one in the hope it was that fancy full-art Pidgeot or one missing, mid-stage evolution for that deck you're building
So, we came up with the mechanic of drawing cards from the bottom of your library instead of the top
When people talk about tempo, that is a shorthand for temporary resource. When you spend two mana to cast a Duskwatch Recruiter and your opponent spends three mana to Murder it, you gained a mana worth of tempo