View attachment for proof.
Wrong. The first Throne Room played a second Throne Room twice. On its first play the second Throne Room played the Witch twice. On its second play it played a third Throne Room twice. On its first play the third Throne Room played a Laboratory twice. That will have been the point at which the number of Actions remaining started increasing from zero.
(Edit: I missed out the third Throne Room in my original reply)
Ah, my mistake. Wow, I didn't understand how throne rooms2 worked afterall. Thanks for explaining.