pokemon shiftry card 013/196 - Lost Origin - Evolution 3 Set [Colorless][Colorless] Shiftry - 11/114 (Reverse Foil)

[Update 28 Nov 2023] More Shiny Treasure ex rare cards revealed

Arid Mesa Bloodstained Mire Elven Passage Flooded Strand Marsh Flats Misty Rainforest Polluted Delta Prismatic Vista Scalding Tarn Stirge Verdant Catacombs Warren Soultrader Windswept Heath Wooded Foothills Yawgmoth, Thran Physician Yawgmoth, Thran Physician

They can generate a lot of value over the course of a game if they're not dealt with, and even when taken out swiftly, force your opponent to divert their attention away from their main goal: killing you

Field of the Dead is ideal in every two or three color commander deck with a sufficient mana base (in fact some of my win conditions are given by Field of the Dead)