Both of these application are a great use of a card
You can't use them in most casual games, for that matter
Your chances for each in place of the foil common are: Sol Ring (Human): Less than 0.3% (1 in 333 packs) Sol Ring (Dwarven): Less than 0.25% (1 in 400 packs) Sol Ring (Elvish): Less than 0.1% (1 in 1,000 packs) Sol Ring (Double Rainbow Foil, Human): Less than 0.03% (1 in 3,333 packs) Sol Ring (Double Rainbow Foil, Dwarven): Less than 0.025% (1 in 4,000 packs) Sol Ring (Double Rainbow Foil, Elvish): Less than 0.01% (1 in 10,000 packs) Your chance of opening any form of a Ring of Power is 0.715%
Sure, other cards do that, but this is superefficient and replaces itself
Jiwari, the Earth Aflame (50 cents/$3) 5 NM foils on TCG for a card thats both niche and should see a lot more play