Activate "Scapegoat" while "Zombie World" is active and use the effect of "Pain Painter" to Synchro Summon "Archfiend Zombie-Skull".
Use another card like "Call of the Haunted", "Monster Reborn", or better yet "Book of Life" to bring back Pain Painter, and use its effect on the other two "Sheep Tokens" to Synchro Summon for another Zombie-Type Synchro, maybe even a second copy of "Archfiend Zombie Skull".
Since you can target 2 other monster to change their Levels to 2, "Number 96: Dark Mist" makes an excellent choice.
Use this card's effect on 2 "Beasts of the Pharaoh". Choose at least 1 "Zombie Master" to be special summoned by a beast so that you can special summon one of the 2 zombie tuners and get another zombie Synchro out (or Pain Painter specifically for a Rank 2 Xyz summon).
This cards effect is also useful for bypassing "Gravity Bind" and "Level Limit - Area B" by bringing monsters level down to 2 until the end phase, enabling them to attack for the turn.