I could imagine this in both a go big Simic list or a go small Dimir list, where you grind your opponent out of resources, while having Riddler sitting in the Warped zone waiting to take over the game
Like Axgard Braggart, it's not the end of the world for Frostpeak Yeti to end up in your deck if you're desperate for playables, but you should be drafting so this doesn't happen
I spoke to Dave Chalker, an extraordinary game designer with deep expertise in both chocolate and peanut butter (I think D&D is the chocolate I forgot to ask Dave)
Kels origins were in asking, what about a sacrifice commander, someone you can build a pack around? Nocturnal Feeder This workhorse features in all four variants of the Minions packs, a basic card thats there to be sacrificed to enable your more powerful cards, like Kels, while dealing damage to your opponent and restoring your own life
Four mana for a 1/5 isnt amazing, but it does start placing counters immediately, and potentially drawing cards too