Worn Powerstone [Vampire and Wizard decks]: Another Sol Ring variant at a slightly higher casting cost
The creatures are here because they are elves, and that means that some of their abilities go unused, such as Kaladesh Energy
if that card was a permanent, you then get to put a +1/+1 counter on Lion Sash
Another perfect example of this is Isshin, Two Heavens As One, which reads: "If a creature attacking causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time." This is an incredible ability to have on a commander - and building a Commander deck around it is sure to be a blast - but in a Standard set it just feels off
The only cons are this card may come out dull against Faeries and Spirits, and it does absolutely nothing if you don't have a creature to cast it on either
Are there any on this list you dont find fun