Max Skeleton start:
Turn 1 play Boulevard of Bones. Summon 1 skeleton.
Turn 2 play Open Grave/Mausoleum forward. Summon 3 skeletons.
Turn 3 play Mirror Realm right of Boulevard copying it and cast Novice Necromancer. Summon 3 skeletons.
You can Panpipes turn 3 for 6 damage and try to force opponet to Dispel/Disenchant to protect your +1 buffs turn 4+.
Turn 4 if no +1 buff play Forsaken Crypt right of Mirror Realm. Summon 2 skeletons.
Turn 5 play Den of Evil forward of Mirror Realm and cast Returned King. Summon 2 skeletons.
Or play non-Open Grave/Masoleum/Forsaken Crypt forward of Mirror Realm, cast Landmass, and play Open Grave/Mausoleum. Summon 3 skeletons.
Turn 6 don't play site left of Boulevard and cast Master Necromancer. Summon 5 skeletons.
Or play Open Grave/Masoleum left of Boulevard and cast 2x Novice Necromancer. Summon 5 skeletons.
End of turn 6: 17x skeletons
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Use Bone Spear for game win. Spore Spouts/Tactical Move/Landmass will help position a skeleton for the projectile.
Pile of Skulls can banish from the enemy cemetery, do this to save your cemetery for Book of the Dead.