While itll take some reps to understand where and when you can go off, the how is relatively easy: make a bunch of mana with rituals, cast cantrips to run up the storm count, mix in a Past in Flames, and then put a lethal number of Grapeshot copies on the stack
If you play a land, cast a spell, or both using the permission granted by Coram's last ability and then have a new Coram come under your control in the same turn, you can still play a land, cast a spell, or both using the new Coram's permission
If a creature card is put into a graveyard this way, return it to the battlefield under your control
You can hard cast an Eldrazi
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Being unable to play instants and sorceries is a big drawback, but remember that conspiracies are meant to be played in a very specific environment