Idea for a Planeswalker Nerf:

They can't use the same ability two turns in a row.

i.e. I summon Elspeth and use her +1 ability to summon 3 soldier tokens. Next turn I can either use her other ability or pass the turn in order to conserve loyalty counters.

In short, it takes a minimum of 3 turns before Sorin and Elspeth can cast their ultimate, instead of 2.

It's only fair. Us players are planeswalkers but we only get 4 copies of the same spell in our library. Why should they be able to reliably spam the same one over and over?

How would this play out in the meta? Would they be much less favored picks or would they still be broken?