Absolutely. You can use a photo as starting point with most (all?) of them. As for getting it right, that may take some practice.
or you can use paint
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That sort of works (text is all weird like usual). Although, as Kharzette mentions above, I don't want to literally copy Magic the Gathering. This will be something completely original, but I want to somehow create a stylized frame."Create a Magic the Gathering creature card called 'Dragonfire' with a mana cost of 2 red mana. The illustration should depict a fierce dragon breathing flames at a group of knights in armor. The flavor text should read: 'The roar of the dragon echoes across the battlefield, heralding the end of all hope.' Please include the card frame with the creature type and power/toughness."
I'm trying to get Midjourney to create fantasy art in a Magic the Gathering style which includes the card "frame". Using "in the style of Magic the Gathering" sometimes works, but often it does not. Any hints on what a good prompt would be to always generate the frame?