Let's say I'm choosing a creature type for my Volrath's Laboratory and I'm inspired by Atinlay Igpay
A regular planeswalker with these abilities (+1: add a counter to a critter, -5: Draw two, -10: Add ten mana) would be pretty middling for what Commander decks what to do
Still, good tutors always see extensive play, and even if it gets relegated to Commander and nowhere else, the demand should keep the price fairly high.
Codsworth, Handy Helper doesnt help with the creatures, but it handles everything else as a mana dork for your equipment, plus a way to get past equip costs
Pluto, Determined Defender and Nani will help keep your high-value questers safe, while Evasives like Don Carnage and Wildcat let you set the pace of the game and keep your opponent on the defensive