User blog comment:BlaZofgold/Buddyfight Theory - Adventurer/@comment-839017-20140722051546/@comment-4844839-20140723034757

Looking at your opponent's hand is always effective as long as:

1. You haven't done it previously (1x Kashinkoji is good, 2x Kashinkoji is pretty much redundant)

2. You don't know what's exactly in your opponent's hand (even if he only has 2 cards in his hand, having the information of what they are is still extremely useful)

Contrary to the popular beliefs, hand peeking is not less impactful no matter how late you cast it. Consider this situation:


 * Your opponent plays Danger World, has only 2 cards in hand and 7 life left, but his field is occupied with 2 monsters (Cerberus and Gargoyle) and 1 weapon (Hysteric Spear).


 * You play the Katana World, are left with 3 life, 2 gauge , and you have no monster on your field . You draw one card, and you have in your hand: Onimaru, Kotaro Fuma, Art of Body Replacement, Shiden, and Kashinkoji.


 * Now you have several options: 1) play it safe, charge Kashinkoji and draw something, use Shiden's ability to generate card advantage, and attempt to clear the field by killing all your opponent's monster, OR 2) forget card advantage , charge Shiden, call Kashinkoji to see if your opponent has a shield, if he doesn't, call Kotaro Fuma and equip Onimaru to go for the throat.

The sample case was taken from my personal experience. In conclusion, no matter how late it is, it's always vital to have information on your opponent's hand. The later could be the better. Peeking is only less effective if you do it more than once.