The idea of this deck is to survive until turn 8 (or 7 with coin) and play Jepetto to pull any of your 3 minions. Hope and pray to not draw them. With cards like rapid fire, arcane shot, and maybe deadly shot, you can kill your opponent in one turn. If you don’t pull Alexstrasza with Jepetto the +7 spell damage should still be enough damage if you have you’re damage dealing spells.
For mulligan, hard mulligan for Jepetto and master’s call if you don’t draw Jepetto. Other keeps are secret plan and animal companion. You can also keep unleash for murloc shaman, as it is really helpful, and you might also want to keep rapid fire as it is amazing when you actually try to pull off the OTK.