Due to the Reserved List and cards from the late 1990s, the truly most expensive commanders in MTG are frightfully dull
(Oh and, this list is in no particular order, even with the technicalities of the last entry) Zack Fair Series: Final Fantasy VII Spoiler Level: Very High (you are basically spoiled already just by reading his name, sorry) Intentional placement of this card as the first entry aside, reading the cards text immediately brings me memories of that final last stand near Midgar
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This is the most common graveyard hate in Magic
To qualify, your main attacker absolutely needs to have these two traits: Firstly, it must be able to set up quickly, and secondly, it needs to do a lot of damage