An interesting practice i recently heard was (which Carters comment just reminded me of):
If you can't decide between two cards, put a little paper into the sleeve with the alternative card written onto it for your test games. If you draw the card, note down how often you would have rather drawn the alternative.
.. the time i used pondering about these little alternatives instead of just playing a few rounds and noticing that they just don't work in a certain deck ^^"
