Emrakul, The Promised End bugs related to additional turn (take control of another player bugs)

[drmDev]

There have been multiple bugs reported with the EMN Emrakul with regards to the additional turn ability. Some reports:

• Only was able to look at the opponent's hand but not use any of their cards. (possibly related to Mindslaver issues Mindslaver does not allow control over other player #1840)
• Though you gain control of your opponents turn, they don't get their extra turn after that.
• "When you get control over your opponent and your opponent used F9, you don't ever get priority as your opponent during his turn. To expand on that: When a controled player uses F9 while you are controlling him and even if you right now have priority as him, you immediately lose priority and don't get it again during his turn. I have encountered this bug now 3 times in different situations, always confirmed in chat that was the reason for the loss of priority." (from forums)
• "After rolling back a controlled turn, the controlled player doesn't get his extra turn" (from forums) - could be related to Rollback bugs Rollbacks may be bugged #2072
• "I could send their creatures into combat and tap their mana but when clicking on cards in their hands nothing happened. " (from reddit)

[drmDev]

When playing vs AI I noticed I could use Switch Hand to see the computer's hand, but they continued to cast spells as usual. After the "controlled turn", the computer did get the extra turn they should. Regardless, the AI continued to cast spells during the turn where I had control over them without me making them do so.

[drmDev]

from forums: "Still unable to control A.I. during Emrakul's take over. The AI still plays it's cards and takes two turns in a row. You are able to switch to their cards, but unable to control which card get's cast."

[drmDev]

Another forum post:

Emrakul, the Promised End didn't let my opponent take their extra turn. I cast Emmy, took control of my opponent's turn, and then when it was supposed to be their turn it became my turn again.

Battle log with opponent as xxxx:

17:11: Turn 24 thenumber23 (4 - 27) //turn when I cast Emrakul
[...]
17:12: Ability triggers: Emrakul, the Promised End [364] - When you cast Emrakul, the Promised End [364], you gain control of target opponent during that player's next turn. After that turn, that player takes an extra turn. - targeting xxxx
[...]
17:13: xxxx takes an extra turn
17:13: Turn 25 xxxx (4 - 27) //during this turn I was allowed to control my opponent
[...]
17:16: Ability triggers: At end of turn xxxx lost control over xxxx.
17:16: Turn 26 thenumber23 (4 - 27) //then it became my turn again, without xxxx getting to untap or draw

I don't know if it's relevant to the bug, but we had a rollback during the turn I controlled my opponent, to the start of the the current turn.

[jeffwadsworth]

This is a confirmed bug. You can look at the hand, but you do not have control of the opponents turn.

[michaelpaulsen]

if the AI uses Emrakul, The Promised End it freezes on the upkeep of the player's turn that it controls.

[JayDi85]

Fixed in #12878