Cheating
MTGA has a serious issue with people summoning and using mana abilities when they don't have any mana available to them. Among other things, some players are just able to ignore the effects of enchantments all together, such ghostly prison, which is supposed to require your oppent to pay 2 for each attack creature. Also, another issuing occurring is watching opponents play cards when they don't have anything in their hand, no abilities triggering to allow then to play from their deck or graveyard. Also there is a rising issue with watching an opponents life total and counters change with no triggering effects to cause it to happen. This more than likely an issue with cheat engines being run on pc developed by third party companies. As it's been an issue for many people as has been recorded on MTGA reporting before you removed the ability for people to actually report something, maybe you guys should look into fixing it or removing PCs ability to play against mobile players. In this last match, in the photos added, this specific player should have had to pay the cost for ghostly prison and wasn't, he was still unhappiness all his dual lands, even though winter moon was in effect. In a match prior to this one, the same issue ghostly prison was in effect and the player had two mana and no treasure tokens, or mana adding anything and was swinging as though the enchantment wasn't there.
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DAC169#34537 commented
Can't say for all of it, but you do realize that Ghostly Prison isn't "opponent's must pay {2} for each creature that attacks," but rather "opponents must pay {2} for each creature that attacks YOU," meaning that they can attack your planeswalkers without having to pay?