Your opponent declares blockers Combat damage is dealt Main Phase 2 Play a land (if you haven't already) Cast creatures and other spells End Creatures heal Pass the turn Aside from this basic "what you can do in a turn," there are a few more technical phases to mention
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Gravestorm may not see much play in competitive settings due to its high mana cost and the availability of stronger graveyard hate cards
Your deck looks completely different, since your goal isnt to one-shot with twenty mana on one spell, but just to ensure a constant churn and overpower with eventual mana and card utilization
When it attacks, you can give something a cell counterand suddenly, all your modified creatures turn into 7/5 beaters for the turn, making it a great finisher that ends games when unchecked
The machine looks unbalanced: slower items remain, but the products people actually want are missing