Harvesting Hands

At the beginning of your endstep if you control Spinal Post, Harvesting Hands,
Hooded Pumpkin and Cobbled Casings, shuffle Harvesting hands and all cards in
your hand into your library. After all triggers
are resolved meld Spinal Post, Harvesting Hands, Hooded Pumpkin and Cobbled Casings into Doomcrow.