Quote Originally Posted by Lemnear View Post
An issue which doubles once you use Grim Tutor for a full PIF loop and cast Grim->PIF->Grim->ToA. That's a full two mana and 6 life difference! Makes one hell of a difference if you play against Burn or Delver ;)
The times where you would want 2 Grim Tutor are definitely all-in situations with a high amount of risk. Grim Tutor for Infernal Tutor w/ an LED generates 4 mana and with Dark Petition generates just 3. Ultimately, in big mana situations where >9 mana is in pool you could simply start a Dark Petition loop searching for another copy or Infernal. It all depends on the contents of your hand, if you have one, and your graveyard.

Oddly I've been using the non-Hellbent feature of Infernal Tutor more often than not because Dark Petition doesn't care about your hand-size. You're behooved to have multiple rituals. Spell Mastery should be a condition that is almost always satisfied. I've had to Petition cold just once, which was pretty ugly, but being able to more naturally tutor a piece of sideboard in Echoing Truth or Abrupt Decay, and keep your hand has its benefits.