Here's the deck I'm using, does not require a specific skill so you can farm drop skills as well. Switch the swamp kings with fusion recycling plant or fusion sage as needed.
Very consistent. He runs zero removal, and the largest vellian can pump a monster up to is 3600. Once an oz hits the field, there is absolutely nothing he can do about it. Crowler also has no otk combos, so you have 2 - 3 turns to get oz out.