As has been discussed many times, a +1/+1 counter is a physical object placed on a card, and is totally distincttotally distinct from a +1/+1 static effect buff from something like Glorious Anthem. Is there any accepted method for marking static effects in order to make the board more "readable"? I typically play casual kitchen table games, but I'm also curious about more serious settings.
For example, with a Glorious Anthem on the board, I'll usually put a coin on each creature I control to represent the +1/+1 effect. If I cast a Nightmare (power and toughness equal to the number of swamps you control) with 5 swamps on the board, I'll stack 5 coins on the card and add more as I play more swamps. In games that also have potential for true +1/+1 counters, I'm very careful to keep separate the true counters from the static effect markers by stacking them in different corners of the card.
Is there a better way I should be doing this? I find the marking of the static effects handy so I don't have to re-count all my swamps or triple check all my P/T values when attacking, blocking or anything else. On a scale of "never do this" to "useful among friends but not acceptable in tournament play" to "that's legit", where does this practice fall, and what are some other options?