Another very important thing to note on Merlin Squirrel/Rabbit/Crab/Goat is that they say, when he leaves play, meaning its triggered whether the card is returned to your hand, banished, sent to your ink well, or even shuffled back into your deck
If you play her on turn 5 while going first, that shuts down a huge amount of the big 5-cost songs being played cheap
I threw together a Golgari (black and green) deck, splashing blue and white in order to play the copy of Atraxa, Grand Unifier that I opened during the event
These cards work well with Chernabog Evildoer and Lilo Escape Artist, and open up the reanimator deck archetype
The problem of course is if your opponents are playing graveyard decks, you could accidentally turbo-charge their win conditions
Combine that with art of Minnie in an adorable scuba suit, and you've got a league promo that's worth earning (if not buying)