Put X +1/+1 counters on a commander creature you control, where X is the power of the creature exiled this way
If return gets more votes, first the active player chooses which cards they'll return from their graveyard to their hand, then each other player in turn order does the same, knowing choices made before their choice
What makes Force of Vigor an especially valuable reprint is its alternative cost, allowing you to discard a green card outside of your turn to play this card for free
I wouldnt push this point too hard in non- Ikoria formats, but I might consider 14 or 15 over 16-lands occasionally, particularly in something like mono-red aggro where I wouldnt have to worry about hitting 8/8 color minimums
You can spend it, just like mana
After that it will shortly disappear on its own, so perhaps theres no need to expend extra effort to remove it