Interesting info about 720
Personally, I wouldn't go for that, while it'll run (in theory) even 720p will be pushing it. If you have to buy new & need a low power requirements small form factor card (it also works for normal size PC's) I would, with a massive push go for the GT 1030 if all I require is 720p. In the UK this card is only around £60-£70 which makes it ok for what it does & as it's in the same ballpark as the GTX 750 should adequately play EDH at 720p.
That said, if you can find a GTX 750ti or GTX 950 for cheaper second hand, I'd go for one of those any day over the 1030.