When AI activates Powerful Broker on itself, it always does so immediately in the first main phase

[tjtillman]

Is your feature request related to a problem? Please describe.
When AI activates Powerful Broker on itself (when Powerful Broker has a +1/+1 counter on itself, it always does so immediately in the first main phase, which effectively removes itself from the game.

Describe the solution you'd like
Activating on another creature in the first main phase is ok, but if it's going to activate it on itself, it should at least do do so in the second main phase.

1. Ideally you'd want it to activate (or not) depending on the board state, but that could be quite complicated to calculate.
2. At a minimum, if activating on itself, it should at least do so in the second main phase, giving the AI the opportunity to attack with it. If not targeting itself, then 1st main is still fine.
3. If that can't be done, could this card be marked to not target itself? This is less ideal, because sometimes it would be good to grow itself. But if 1 or 2 cannot be implemented, this would be superior to how it currently acts.
4. Failing all of those, could it be marked to not be played in AI draft and sealed decks?

Version 2.0.14-SNAPSHOT-07.16