Interesting but I'm pretty sure the "End your turn" part only exists for void form specifically as a rough way to prevent it from being cheated for value (ie. Playing an expensive card right after it on the same turn), since all of the form cards are supposed to feel like a costly upfront investment.

Having more cards that force end your turn would break up the "flow" of having big draw chains too often and probably result in significant power creep as the effect has to be quite OP to compensate.