Auron, Venerated Guardian* From Final Fantasy X Counter Blitz Commander Deck, Auron isnt the best removal but he is a consistent attacker who works with the decks synergies and takes out problematic creatures
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Arcum Dagsson is a great way to upgrade your Vehicles - turn one into a Creature, attack, do damage, then sac it and put a much better Vehicle on the 'field
If you just use the MDFC lands where the land only exists on the back half of the card then its classed as the front half type when its in your deck (or anywhere else that isnt the stack or the battlefield)
Dimir mills itself pretty well, giving Raul a steady stream of cards to cast, plus some synergies with Secrets of the Dead and Prized Amalgam