You can only activate this effect of "Unending Nightmare" once per Chain
Your image contains a collector number (that first number at the bottom of the card 71 /244) and a set symbol (the one for Avacyn Restored, aka AVR )
Introduces new members/support for the "Abyss-", "Arcana Force", "Atlantean", "Azamina", "Chaos", "Clear Wing", "Crystron", "Evil HERO", "Fiendsmith", "Gladiator Beast", "Goblin", "Goblin Biker", "HERO", "Materiactor", "Mermail", "Metalmorph", "Mulcharmy", "Neos", "Primite", "roid", "Shark", "Shien", "Sinful Spoils", "Six Samurai", "Six Strike", "Snake-Eye", "Speedroid", "Synchro", "Synchro Dragon", "Synchron", "Tenyi", "White Forest" and "Xyz" archetypes, as well as the Contact, Flame Swordsman, Signature move, Trap Monster and -Eyes Dragon series
Details Passcode: 54828837 Card Number: SDSA-EN019 Rarity: Super Rare Card Text: To Special Summon "Hamon, Lord of Striking Thunder" using its own procedure, you can also use face-down Spells you control
2019 PKM
You win many counterspell wars, not to mention stealing ramp or card draw
