Weaknesses Setup-Dependent : Marneus can feel clunky without treasure generators or token synergies in play
Many of the planes giant monsters have cycling on them, as well, which will allow you to cycle them away for a new card if you wont have enough mana to cast them for a while
Theoretically, we could have an opening hand where our only lands are found in DFCs, and still keep it on clean conscience
He's often my default Vanguard to draft in a generic brew
Check out my previous examinations: Revisiting Commander 2011, Revisiting Commander 2013, Revisiting Commander 2014, Revisiting Commander 2015, and Revisiting Commander 2016
What really pushes me here is the ability that many Spirits have, that whenever you play a Spirit or an Arcane card, triggers happen