You pay all costs and follow all timing rules for spells cast from your graveyard with the permission granted by Forgotten Cellar's ability
For starters, there are some mechanics like madness that can be used along with it, as seen with the famous Hogaak, Arisen Necropolis deck that runs Basking Rootwalla and Blazing Rootwalla, along with filling your graveyard as part of its plan
It can also be activated in the phases following combat too but for Arni Brokenbrow, were looking to do combat tricks with this cards boast ability
But it also took us about three hours to sort and research everything, plus time to list and sell the individual cards
Enkira, Hostile Scavenger takes full advantage of this by gaining indestructible whenever it and at least two zombies attack, making it nearly impossible to deal with in combat
You can either run to the side of the orbs or dodge just before they hit the ground to avoid this attack