I tried it for a while but didnt like it that much since i have less Darkness quantums to use for drains but it works decently ide say.i use sundials to shield off attacks while im getting quantums
i dont agree ur idea because1. Otyugh will eat Pest ( need Earth (mark) )2. i dont think Siphon good enough to kill enemy it 100! 100!! HP
What if you took mark of Earth for Pests and also a 2-3 Earthquake? That should slow the opponent down even more.