Looking past the idea that the deck could have included more alternate win conditions, 20 Ways To Win certainly seems worthy of purchase if you like the aesthetics of the mythological interpretation of the tanuki
Dismember takes precedent here over cheaper removal, as the Phyrexian mana alternative cost can be offset by us gaining some life casting it (much like Snuff Out)
Overwhelm your opponents with a swarm of Shapeshifters, or just invite them in to enjoy the good timesits your party
Again, with such damage-based removal in the deck, it works very well to finish off something after Ryusei dies
Strider Harness is an awkward card in most decks, but perfect for you
Sometimes the artwork on the serialized cards is found on non-serialized versions, but most new serialized cards get their own artwork or frame to increase the specialness of the card, which seems like a great move