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Grim Monolith ($472) Grim Monolith is at the heart of many infinite mana combos

I think that the most powerful mill pieces are the ones that require minimal extra work from the mill player, and Mindcrank is a prime example

Blitzwing, Cruel Tormentor/Adaptive Assailant (6/10) Triple changers are great in Transformers, and Blitzwing has always been a standout, being able to change into either a tank or plane, both great for combat

If you love decks that thrive on momentum and thrive even more when the table panics, Abaddon's your warlord

Then in your upkeep we can make free colorless mana equal to our artifact count including tokens like Treasures et all but only for artifacts though