It's a Poketool that lets its wearer use the attacks of their preevolution
Boros Energy (21.1% of the Winner's Metagame) 4 Ajani, Nacatl Pariah 4 Guide of Souls 4 Ocelot Pride 4 Phlage, Titan of Fire's Fury 4 Ragavan, Nimble Pilferer 4 Galvanic Discharge 4 Arid Mesa 4 Marsh Flats 3 Arena of Glory 3 Sacred Foundry 3 Goblin Bombardment 3 Seasoned Pyromancer 3 Flooded Strand 2 Elegant Parlor 2 Thraben Charm 2 Voice of Victory 2 Plains 2 Ranger-Captain of Eos 1 Mountain 1 Blood Moon 1 Windswept Heath 3 Obsidian Charmaw 2 Wrath of the Skies 2 Celestial Purge 2 The Legend of Roku 2 Wear 2 Orim's Chant 1 Blood Moon 1 Surgical Extraction Powered by Guide of Souls and Galvanic Discharge, Boros Energy leverages the energy mechanic to dominate the battlefield
We will also add 4 copies of Friends on the Other Side because it is such a good card and also quite cheap
Some even argue that veterans at Wizards of the Coast, who have been there since near the start, may be financially incentivised to keep the Reserved List so they can retire with a folder full of cards from it
This is called the legend rule. Planeswalker cards used to have a slightly different uniqueness rule: 306.4
You cast any of the exiled cards you wish to cast for free while this scheme's ability is resolving
