Archfiend's Vessel fix on the way. Thanks again.
Pulse of Llanowar bug may have been something else in the board state. I just tested it in a simple board state and it worked normally.
EDIT - it seems that if you manually tap in advance, P.o.L. behaves normally. I was able to get it to behave badly by tapping basics after being prompted to pay a cost. Still got the desired result, but had to go through the prompt twice. No idea why it started randomly prompting you in the middle of a match yet.
I'll look into the Sphere, etc. soon