The main strategy is using multiple massivemorph on Ultimate Ancient Gear Golem or Ancient Gear Golem so they cannot attack directly, then have them destroy Kiseitai so that you can heal your LP every turn equivalent to half their attack points. This will heal you so much that any other attack Vellian does cannot kill you.
Temple of the Mind's Eye turns any battle damage you will receive into 1000 points, helping you survive longer.
Good Goblin Housekeeping and Jar of Greed helps you draw out the cards you need.
It is best to use Curse of Anubis during the start of the battle phase when Vellian cannot summon anymore monsters and before he attacks with his ancient gear monsters with protection effects.
On the final turn, set a Temple of the Mind's Eye face down to destroy the current active one. Summon Cosmic Compass and bring out two other tokens and then use double summon to tribute into The Winged Dragon of Ra. Activate The Winged Dragon of Ra's effect to boost his attack and remember to activate Anti-Magic Arrows at the start of the battle phase.
Winged Dragon of Ra when Normal Summoned, other cards and effects cannot be activated so how can I activate Anti-Magic Arrows? It doesn't work. When I attack he activates trap card and that is The End for me because it was my last turn.
I use something similar, except Slifer instead of Summoner. Heck, there's no need for Vassal, either, because using a Divine Beast nets you the 1000 you'd normally get for Effect Damage Only.
Array + Medusa locks down Crowler forever until you reach Cards on the Brink, summon Slifer, AMA and attack directly to victory
Man this sucks, I can't farm this bastard mainly because I don't have the cards necessary which require lot's of farming from other characters and other packs that I have no luck in when getting specific cards.
Aura of Revealing light + medusa worm works well. Once you have them down, keep activating worm to remove his summons. Rest of deck is anti machine and stallers such as Acid Rain, Magnetic Mosquito, A Feint Plan.
What do I need to do to fight him lvl 50? He spawned as a LD lvl 40, I beat him and then he showed up lvl 50 but that happened only once ... is there any trick to let him spawn more often? thanks in advance