Blue shouldn't have much trouble enabling the Web Slinging ability, as Spyglass Siren has been a Standard role player since it was printed
The precon also comes with some smashing reprints, particularly cards that were in desperate need of one
While single cards can spike in price, sealed booster boxes, packs, and promo sets tend to appreciate over time

Sort Rarity Card Type Bulbasaur - 1/25 #1Promo $1.20 Chikorita - 2/25 #2Promo $0.54 Treecko - 3/25 #3Promo $0.46 Turtwig - 4/25 #4Promo $0.57 Snivy - 5/25 #5Promo $0.42 Chespin - 6/25 #6Promo $0.42 Rowlet - 7/25 #7Promo $0.52 Grookey - 8/25 #8Promo $0.36 Charmander - 9/25 #9Promo $0.73 Cyndaquil - 10/25 #10Promo $0.51 Torchic - 11/25 #11Promo $0.55 Chimchar - 12/25 #12Promo $0.40 Tepig - 13/25 #13Promo $0.35 Fennekin - 14/25 #14Promo $0.40 Litten - 15/25 #15Promo $0.42 Scorbunny - 16/25 #16Promo $0.41 Squirtle - 17/25 #17Promo $1.62 Totodile - 18/25 #18Promo $0.74 Mudkip - 19/25 #19Promo $0.80 Piplup - 20/25 #20Promo $1.02 Oshawott - 21/25 #21Promo $0.61 Froakie - 22/25 #22Promo $0.46 Popplio - 23/25 #23Promo $0.40 Sobble - 24/25 #24Promo $0.51 Pikachu - 25/25 #25Promo $4.63 Pikachu - 25/25 #25Promo $4.63 Squirtle - 17/25 #17Promo $1.62 Bulbasaur - 1/25 #1Promo $1.20 Piplup - 20/25 #20Promo $1.02 Mudkip - 19/25 #19Promo $0.80 Totodile - 18/25 #18Promo $0.74 Charmander - 9/25 #9Promo $0.73 Oshawott - 21/25 #21Promo $0.61 Turtwig - 4/25 #4Promo $0.57 Torchic - 11/25 #11Promo $0.55

Instead they mutate into a Ghoul, which despite the sloughing skin and exposed muscle are not undead Zombies (which is a big flavour fail for every Ghoul card in this set but I get it, game synergy), but a mostly stable form of mutant