Proxies are also useful if you want to test out decks before committing to purchasing them
Featured Image Credit: Nintendo/Wizards of the Coast
In their simplest interpretation, somewhat similarly to Structures, Battle cards act as Enchantments that can be attacked by their controller (but they are not Enchantments, they are Battles)
Now, look at the Unlimited Blastoise card, and scan the bottom of the gold border you can see a shadow in the space between Blastoise and where it says "Shellfish Pokemon"
For that set, I balanced my picks fifty-fifty between the two factions: Ants Magic History Cube In the end, I came to the final list linked below, containing equal distributions of cards from Revised through Khans of Tarkir
Players can add or remove loyalty counters from a card