My playgroup followed the rules listed here
Im not very interested in Mirkwood Channeler, but the rest feel like they will find a home somewhere
Marwyn, the Nurturer Formerly the top elfball commander and still one the best mono-green commanders, former cEDH staple Marwyn, the Nurturer still ramps to throw a lot of elves on the table, and a Marwyn Commander deck can include a variety of combos if youre so inclined
The reason Opt is so valuable is that it is instant, an effect easily worth a 25% decrease in power for this kind of card
If the spell has any mandatory additional costs, those must be paid to cast the spell
There is even a card scanner, if you have a pro subscription, where you can scan your card and get price estimates of the specific card