2023-05-12 : Blot Out targets only the opponent, not any permanent. A permanent with hexproof may be exiled this way if its mana value is the greatest, for example.

2023-05-12 : Consider all creatures and planeswalkers the target opponent controls as one group to see which one has the greatest mana value. For example, if the opponent controls a creature with mana value 3 and a planeswalker with mana value 5, they must exile the planeswalker.

2023-05-12 : Which creature or planeswalker will be exiled is determined as Blot Out resolves.