Reliquary Tower plays an important role while you dig through your deck. You can play it on turn 1 or 2, but even if your don’t have it, you can wait until you get it with a Treasure Hunt and play it at the end of a turn, if you still need it at that point. Ideally, Zombie Infestation should be your turn 2 play, but even if its not, that’s still okay. Hopefully, Treasure Hunt will find one that you can play on turn 3. You will most likely have to mulligan a few times to get what you need. The lowest you can go is probably to the point where you have Treasure Hunt and a land. If you can’t get Zombie Infestation or Reliquary Tower in your opening hand, that’s okay. Treasure Hunt is more important so as long as you have that, you’re good. Casting it will either find another Treasure Hunt or Zombie Infestation.