Toby, Beastie Befriender does a lot of stuff right, and it works well with populate, blink, tokens, and more
Alela, Cunning Conqueror can still give you tokens, though these are black Faerie Rogues rather than Alela, Artful Provocateurs blue Faeries
Lifegain also overlaps heavily with two other archetypes worth raiding for pieces: vampire aristocrats (Vito, Epicure, Licia all live here) and go-wide tokens (every token that enters is a Soul Warden trigger)
Some people just hate it when you mill their cards
Magic has tons of ways to complete this type of transaction already utilizing cards like Trading Post to receive some kind of reward in exchange for doing something
Part of the rules of Magic the Gathering Online, is that if any customer has a complete set of cards in the online game, he can request the electronic set be removed from his Online account, and shipped to him as an actual physical Magic The Gathering Set