Our 14 year old has gotten into Magic: The Gathering (ah, a boy after my own heart) and now has thousands of cards in collection boxes under his bed
Cards like Glimpse of Nature, The Great Henge, and Beast Whisperer reward casting creatures with card draw, and they often see play alongside mana acceleration
The only minor issue with the Piper is that sometimes you'll want to use the Piper's activated ability while it's night on your turn, which is a bit awkward
While I'm not convinced this is true, it is worth keeping in mind if you are thinking about buying into the archetype
As for which is best with AzlaskAzlask, however
On yet another axis, youre sacking a lot of creatures anyway so maybe you want something like Whisper, Blood Liturgist