Legality depends on the tournament format -- Lucille can be legal in some formats and banned or restricted in others
Verdeloth won't give himself +1/+1 unless he somehow becomes a Saproling
Sure, a measly +1/+1 counter doesn't seem like much, but when you have the deck built around it and include graft cards like Plaxcaster Frogling and Helium Squirter, you can really start doing your opponents some favours, which of course is the number one way to ingratiate yourself to those who might otherwise wish to do you harm
Tidebinder Mage is often a removal merfolk at multiplayer tables, and True-Name Nemesis can become a surprising game-winner when you've got your merfolk buffs working
The random, chaotic element wasnt everyones cup of tea but spiced up matches and kept the usual meta-chasing deck builders from brute forcing wins in what was ultimately a casual format
It will be sold by lottery at the Pokmon Center Online