So i just ran against 50, if you run a cerberus/vassal deck you should be fine. his first intent is to get relinquished out and grab your monster. if you do not set anything he wont summon anything. i tried posting pics but it said the files to big -_- If you can wait until he has 3 monsters and throw a Grarl Axe on Cerberus and get 2400 atk or higher you should be good, leave at least 1 spell slot open for your last move. make sure you have 0 cards left when you make your last move. as well dont play a Shard of Greed if you have less than 4 cards left. Do not use riryoku on vassal or any gravity axes. this is the deck i used and landed 7,200 Mythical Beast Cerberus - 2 Gravekeeper's Vassal - 1 Riryoku - 1 Shard of Greed - 2 Twister - 1 Union Attack - 1 Gravity Axe - Grarl - 2 Shooting Star Bow - Ceal - 1 De-Spell - 2 Soul of the Pure - 1 (or any health gain card) Yami - 1 Stop Defense - 1 Secret Pass to the Treasures - 1 Spell Purification - 3