Gengar [Gamestop] #50 (Pokemon Perfect Order | Pokemon Cards) prices are based on the historic sales
Yarok affects a permanent's own enters-the-battlefield triggered abilities as well as other triggered abilities that trigger when that permanent enters the battlefield
You'll need a deck that can make use of your milled cards to get the full value out of Palantr of Orthanc (above all early on, when your opponent is unlikely to let you draw), but once the counters start piling up the Palantrs often a free card per turn

45 card deck Spells: (2x) Ground Collapse (Chazz), (2x) Instant Fusion (Alexis), (2x) Kaiser Colosseum (Bastion), (2x) Messenger of Peace (Kaiba), (3x) Secret Village of the Spellcasters (Yugi), (2x) Soul Absorption (DK DLC), Terraforming (Grandpa) Traps: Call of the Haunted (Bakura), Imperial Custom (Crow), Jar of Avarice (Zuzu), (2x) Ojama Trio (Chazz), (2x) Spirit Barrier (Bastion) Monsters: (3x) A Cat of Ill Omen (Kaiba), (2x) Aroma Jar (AtD:YJ DLC), (2x) Drill Barnicle (Reginald), Ebon Magician Curran (Mai), Ghostrick Witch (Cathy), Neo Spacian Grandmole (Jaden), (3x) Numbing Grub of the Ice Barrier (Trudge), (3x) The Unhappy Girl (Chazz), (3x) Timebreaker Magician (Gong), (2x) Timegazer Magican (Yuya), (3x) Zany Zebra (Gong) Tips: Instant Fusion summon Thousand Eyes Restrict and then use him to capture a card then use Timebreaker Magician to banish Thousand Eyes Restrict until the next turn