Pre-MLB 1908 Greenville Spinners Joe Jackson 12-by-14 Cabinet $134,200
Its ideal for Commander players who want to proxy either a few pricy cards, like Gaea's Cradle, or duals to supplement their collection or who want to buy entire decks of proxied cards rather than cutting slips of paper and sticking them into sleeves
However, it does give you energy all on its own and because it also returns to your hand when you activate it, its going to keep giving you energy
Likewise, a non-Commander staple like Thoughtseize isn't all that good in EDH, and therefore doesn't achieve Commander staple status
For example, you can look for cards that increase life points, decrease your opponents life points, or maybe destroy all your opponents monsters
1 Non-foil borderless, Ninja, Samurai, Phyrexian, or soft glow rare or mythic rare 1 Non-foil extended-art or borderless rare or mythic rare