So compared to Hangarback Walker:
- Adding a counter costs 4× as much but doesn't require tapping.
- When it dies you draw cards instead of making Thopters.
It's not a direct replacement but I think this has the potential to be a stronger card overall, especially in a deck that can make a lot of mana. I don't know if there are any existing Standard decks that want this, unless maybe Domain Control or other Overlord of the Hamhocks decks could use it as a mana dump. But there are some fringe Selesnya decks with stuff like Ozolith and Innkeeper's Talent and Dusk Legion Duelist that might get a boost from this.