Since its an equipment, you only need to have one creature in your hand and one creature on the board to attach Grimoire and attack, bypassing the mana costs of the card in your hand
This is key, as during that player's end step, they can return a creature with a mana cost less than or equal to the number of experience counters they have from the graveyard to the battlefield
1 Azami, Lady of Scrolls
That being said, the Emerald/Steel is still a very good deck and very fun to play

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Hellkite Tyrant Ive seen Hellkite Tyrants alternate win-con happen exactly once throughout my entire Magic career