IV is used exclusively as 4 (except for clocks as someone else already commented) since the 15th century. Ancient Romans used both writing, IIII and IV.
I remember when I had to book a plane ticket, I seen it as saving moneys by doing it earlier. Then set yourself a deadline, over stress about it, tell yourself you must book it before then or the trip won't happen. I do it with myself about tasks, and sometimes it works. Sure it fuels anxiety, but well, it's not like we was'nt already swimming in it...
You underestimate my need of superiority, every one will deserve my explanation, men, women, children, fish, cat and dog, and the explanation of my explanation and it's prequel and sequel. Yep, I have adhd.
Is it wrote on the market page of the game as requirement for play ? If yes, why it shouldn't apply to the deck ?