If the copy is a permanent spell, it gains haste and "At the beginning of your end step, sacrifice this permanent." (A copy of a permanent spell becomes a token.) Legendary Creature - Wizard Goblin Nalfeshnee Flying Whenever you cast a spell from exile, copy it
With Miirym, generating Treasures allows you to cast expensive dragon creatures and copy them while keeping enough mana open for removal and counter spells
However, the big addition here from Crimson Vow is Voice of the Blessed
If Magic: The Gathering formats like Standard or Brawl feel too limiting for you, it's worth giving Historic a try, as the massive card pool can often mean some truly broken decks are still active, and the games can get truly chaotic, in the best way
Living Weapon puts a corrupted, or 'compleated' spin on equipment , tying it thematically to the perfection-seeking Phyrexians, and further tainting the world of metal that they overtook
And should your necromantic plans fail, you still have a powerful card advantage engine and a threat growing more potent each turn