If you only want one Shanks for display, the -v4 is consistently $3060 cheaper than the -v6 for what is functionally the same artwork at a slightly lower foil treatment
Menace, prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) Other Allies you control have menace and prowess
Voice of Victory This creature is a Grand Abolisher that is easier to cast, at the cost of not preventing your opponents from activating abilities of artifacts, creatures, and enchantments
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This makes Sephiroths go-wide plan fairly feasible, which is unusual for an Equipment deck
To help determine your Commander bracket, check if your deck does a 2-card infinite combo or not