Source

• rarity: added

|Notes from the original thread:| |-| |

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• This use of the supertype elite is meant for custom cards first and foremost. As such this is a opt-in mechanic.
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• When using these a commander can be added to a game that original started without commanders e. g. if you put Big Boo into your otherwise 60-card deck.
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• As a commander a promoted elite creature deals commander damage and optionally goes to the command zone when leaving the battlefield and can be recast with commander tax. Track those separately from pre-existing commanders as you would for partners.
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• Command Tower now can produce mana in formats where both it and elite creatures are legal - but still wouldn't be exactly a premier choice.
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• To make sure your commander is tracked correctly in formats that are not singleton I have devised multiple options. Here is one I am currently happy with: When you promote a creature to commender you use a reminder card (similar looking to a token/emblem/checklist/morph overlay/monarch card) that says "Commander" and place it similar to an Aura/Equipment behind the card. The reminder card should be sleeved the same as your deck/needs a normal Magic card back. If you commander goes to any zone other than the command zone (especially a hidden zone e. g. library) you place the actual elite permanent card in the command zone and instead move the reminder card as a placeholder to that zone. This way you can keep the promted elite distinct from other copies of the same card (e. g. when drawing them later).
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• While this mechanic uses commander rules heavily it was not created with commander in mind. It instead is created top-down from the idea that an "elite" minion might be something like a video game mid-boss where the first appearance of an enemy makes a boss-fight in e. g. level 1, but becomes a normal mook in e. g. level 4. Once I devised rules to achieve such a feeling they were so close to making the card a commander that I decided it would be easiest to explain and understand if I just did that.
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• I am primarily concerned with viability: Would players want to be able to do something like this in the first place? Which formats would like this? Are the decisions meaningful? How vast is the projected design space? Am I undercutting other options/design space?
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• I am aware that copy effects can turn a Clone into a commander. I see no problem with that.
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Suggested alternate wording: "When Big Boo or another Commander creature you control deals combat damage to a player, that player discards a card."

I think I like it.

Another suggestion is to restrict promotion to commander more e. g. from hand (before casting it - compare suspend).