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
These two cards have a really low population, less than 23 of each exist at this grade [PSA 10]
Pokmon with standout artwork, full art or secret rare versions, or just memorable designs always attract attention
The ability of Jolly Gerbils triggers when the gift is actually given
Cards with the beautiful Ravnica City treatment can appear serialized in traditional foil, each with 250 English-only copies
A great example here is eBay: You can score some seriously good deals by combing through the listings, particularly if a seller has underpriced something inadvertently