Overall, I see these targets as good for 10-30% per annum gains over the next eighteen months or so, with further upside if a wave of buyouts happens to target them anew
But, if youre in a Commander meta where people are not trusted when they say what their decks cant do, these cards may well make you an unwitting target
This is mostly a Commander card, because its more than a little bit banned in most other formats, but when it works, it can skyrocket you to greatness, especially if you pair it with a card like Sol Ring
If you can get your hands on it, I would say you are certainly getting your moneys worth, and if you want to supplement it, I hope this has helped a bit
That first line that gives him a discount for each land in your graveyard also affects his commander tax, which means that with a little setup, casting a 6/6 for 3 mana can become somewhat trivial