In the context of Commander, Yuna acts as a pseudo version of The OzolithThe Ozolith, but rather than the counters of the dead creature retaining their classification, Yuna effectively converts them into +1/+1 counters for another creature
This is a fantastic example of a card that really feels like it needs the restriction of only being activated once per turn
Although Mendicant Core is handicapped by the Start Your Engines mechanic, it can be an incredibly powerful card: tuned to peak efficiency, it can, for example, vomit out extra mana rocks to feed an army of unstoppable Karnstructs
air-dry flat
The Soul Stone would likely be in the top spot even without this ability, but its a lovely extra to have
Escape to the Wilds If you can cast Escape to the Wilds and play all five cards it exiles, you have a lovely chance at winning the game