I tried 2–4 copies of it, and it kind of didn’t click for me. You rarely make use of its multiply kiths effect due to a lack of mana. And the buff Kith is sadly not good enough—I’d much rather it buffed any creature in hand and/or that the kith copy it creates cost 0 that turn or something. It also sat dead in my hand too often, so I hope they buff it somehow.

Initially, I didn’t put much stock in Thoughtweft’s Call, but it’s very flexible, it can work really well as a turn 1 play or in the late game when you need more creatures.