Personally, I'd replace Ledger with Sangan. Sure, Ledger can get you three cards, but if you have a hand that's nothing but Yubel and Ledger, or nothing but Nephthys and Ledger, you're not gonna be able to survive for the three turns required for Ledger to pay off.
And you're talking about that on the Level 40 farming page... why? Not for nothing, but there's a whole other web page for talking about "How to beat/farm Professional Aster Lvl 30." Besides, if you're that worried about Decider, just run a copy Soul Release, Skull Meister, Foolish Return, or any other other card that'll negate Decider and/or remove him from the grave. Problem solved.