My brother played Agent of Treachery and stole my "tapped" creature card.
The agent of treachery's text is as follows:
Creature — Human Rogue Card Text: When Agent of Treachery enters the battlefield, gain control of target permanent. At the beginning of your end step, if you control three or more permanents you don't own, draw three cards
Now he moved onto combat like immediately after and then untapped and tried using my creature to attack, and I said it can't attack because:
- It has summoning sickness,
- It is still tapped.
He countered that the official Magic: The Gathering video game used this card and it let him attack right away. I said; well it's gotta either be tapped or summoning sickness for sure. We found out that yes it has summoning sickness. Once he found out, he decided it can't attack, attacked with a different creature but then also didn't fix his mistake of untapping.
When my turn came around and I attacked with everything, he was 1 short of a blocker(my claim) and literally on 1hp. I said it was still tapped and couldn't block so hence: short by one. He says it get's untapped by stealing. I've found cards that let you steal and untap so if this particular card could do so, it would be put in the text. And upon hearing this argument he claims that he wouldn't have attacked on his turn because he knew he'd be short.
I'm pretty sure I'm in the right here about it still being tapped, but if there's a specific rule that I can point him to, that'd be great.
And what do you usually do when we find out about a rule change and upon hearing it would like to change previous turns. Is there any official rule about this? Or is it more of a case by case on how the players feel. Cuz in this case, letting him take back would result him in winning next turn, and him not able to take back results in me winning.