I'm building a Jon Irenicus, Shattered One deck and wanted to know how his ability to give a creature "this creature can't be sacrificed" would work with something like Blood Pet or even Mausoleum Wanderer? Would I just be unable to use the ability? Would I make infinite black or counter spells for free?

I also wanted to confirm if he can actually end the game in a draw with some like Merchant Ship or Pirate Ship if anyone has an answer? I believe it would because of a mandatory loop but want to be sure.