MTG Salvation

Yeah I thought about the Mindflayers from DnD but he specifically stated it's a MTG reference and the Mind Flayer card got released after this series.

Mindslaver actually makes a weird kind of sense though, in regards to losing your mind at least.

So I was watching Marvel's Runaways just now (which is a really bad series, won't recommend) and one of the characters just made a MTG reference but I don't seem to get it. Can anyone help me understand what this guy means?

"Maybe you saw some dark dimension version of me, okay? Minds kind of get broken over there. Now that I'm back, I'm fine, okay? Trust me. It's not like I played a One With Nothing Card and I got mindflavored, okay? If I did that, then you'd have to send me on back there."

I mean I know tha One With Nothing card but what is mindflavored and why would you use this in a sentence like this?

So what would happen if I play my mercurial transformation on an enchantment aura? The aura would become a creature and, does it detach from the permanent it enchanted? And if so, does it attach back at the end of turn or will it become illegal at the end of turn?

Ah right that's true! So does a cancel have the same effect then?

In that case, if I choose to let cowardice's ability go first, can't the glasskite counter cowardice's ability then? And that would mean the ability/spell my opponent plays is the second ability/spell so that one can't be countered.

EDIT: nevermind that doesn't make sense cowardice keeps on triggering of course

Okay say I have a cowardice and a shimmering glasskite, my opponent tries to target my glasskite, does the glasskite still return to my hand or does the spell get countered first?