25 Shaymin EX ($20, For Now) Starting it off at around $40, the Shaymin EX card is part of the Roaring Skies expansion in 2015
Waterbender's Restoration Waterbender's Restoration can flicker all of your creatures by just paying 2 mana and waterbending some permanents, which can be your own creatures or any artifacts lying around
Many can be proactive or reactive based on your needs Lightning Helix can be sent at the opponent's face, or it can be removal for a pesky planeswalker or creature
ART 2012 (1/1) Consume Spirit cropped art by Dan Scott
Its an ideal method for exploring sky ruins
This is especially popular for powered cubes, vintage cubes, dual lands, reserve list staples, and highly optimized Commander environments where replacement costs can become extremely high