Sheoldred cannot be targeted/countered
Playing a game in Standard Ranked on iOS/iPad Pro 11" 2nd Gen, I used "Flip the Switch" to counter someone playing Sheoldred/The True Scriptures.
Upon attempting to target her on the stack, it prompted "are you sure you wish to target Sheoldred?" which I thought was odd, as this usually only occurs when there's a Ward or other penalty at work.
Upon resolving, Sheoldred entered the battlefield without a problem, I got a 2/2 Decayed token (as Flip the Switch does) but Sheoldred was not countered. I've looked the card over, and nowhere in its effect does it show that it cannot be countered. I know the opponent had tapped all their mana to play Sheoldred, so something went wrong and I don't know how/why.
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Rezzahan#77802 commented
Most likely paid for with mana from a Cavern of Souls set to Phyrexian. Hence why you were asked if you were sure.