Once per battle, if a monster battles another monster, during damage calculation (Quick Effect): You can make each battling monster gain ATK equal to its own Level x 200, during that damage calculation only
Most job select cards play out like curve filler to start but have some subtle strengths in this set such as: Being an artifact for artifact matters cards (very relevant for WU and UB)
The rest is practice, experience, experimentation, and learning from defeat
The best thing about an effect like Feast of Sanity or Glint-Horn Buccaneer is they broaden our focus from effects that let us discard for profit to just effects that let us discard. This opens the door wide to generically powerful, consistency-enhancing effects like cycling, looting, windfalls and of course, wheels
The next move I would use Hard Crush again, unless the defending Pokemon would be knocked out by 60 damage then I would use Upthrow