in the log most important thing to check is their abilities (damage, random damage, haotic damage, lifesteal, energy burn, heal, regenerate, defend, martrysm, weaken defence) and targeting (random, weak creatures, strong creatures, dying, multiple, all). Then try to think up a ritual to minimaze the damage you get and maximize the damage you make. Also don't be afraid to test all kinds of diferent ritual without hoping to win but instead to help you see what happens in different situations.