User blog comment:BlaZofgold/Buddyfight Theory - Adventurer/@comment-11372432-20140719224611/@comment-4844839-20140720151413

Running Oracle of Tuval/Dragonic Grimoire is pretty much optional. I can't tell you to run them or not to run them, but I'll give some examples of how they can be useful in general:


 * If you are an aggressive player (you play a lot of cards each turn, and you pretty much run out of cards by your 3rd or 4th turn), then Oracle of Tuval is preferable to you


 * If your opponent is a conservative player (he/she prefers to kill your monsters instead of attacking you directly), then Oracle of Tuval is preferable to you

However if you find yourself (or your deck) to be conservative, and you don't often run out of cards even after 4th turn, then you might not want Oracle of Tuval in your deck. Although if you ever decide to run some, my advice is run 2 at maximum at all time.