This delightful lockdown pairs Mystic Decree with Form of the Dragon to create an absolute defensive fortress. By stripping every creature in the game of its flying ability through Mystic Decree, you completely neutralize the primary loophole in Form of the Dragon's text, since its restriction that non-flying creatures can't attack you now applies to literally everything on the battlefield. With no creatures able to swing your way, you are left completely safe behind this enchantment's walls while its upkeep damage steadily closes out the game.