Once you get used to the battles, you can also learn the rules thoroughly with the included "Step-Up Guide"
Then, when they enter the battlefield, either each other Creature gets -X/-X until the end of turn, and you lose X life, or you can return up to X Creature cards with a mana value of X or less from your graveyard to the battlefield, and then give them haste until the end of turn
Kagemusha of the Six Samurai effect could only redirect targeting effects that targets a single Six Samurai monster, and thus would be unable to redirect Icarus Attack which targets 2 cards
It allows you to shuffle two of your cards from your hand into the deck
So, my advice, spend big now on a 36 pack of boosters, or spend a lot less in a few months time when prices have settled a bit more
All in all, dont sleep on him