It was originally produced as a prize for a Japanese magazine contest in 1998 and, as a result, the card is considered a "holy grail" in the collecting community
Resealable adhesive strip
You can usually sell damaged cards online or at your local hobby store
Kindred Discovery costs five mana and is an Enchantment where you have to choose a Creature type when it enters
There are five MTG planeswalker cards altogether in this collection: Elspeth Tirell - $0.75 Liliana of the Dark Realms - $17 Jace, Unraveler of Secrets - $4.61 Freyalise, Llanowar's Fury - $1.84 The Royal Scions - $0.50 Total - $24.70 As you can see, most of the value here comes from Liliana, and none of the cards see any play outside some niche usage in the Commander format
Joey agrees, and says they should go find Kaibahe has to be in one of these rooms