I guess I only threw Master of Cruelties in there in case they had something to counter my milling. Similar with Jace's Phantoms/Consuming Aberration/Wight of Precints. Etc.
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Also thank you for the input!
Yeah I just learned today that what I actually play is Modern. So those cards should be allowed.
I would also like to know which card it is flagging as illegal in standard.