It is Tyler the Great Warrior. There was only 1 printed.
The rarest card in the world is Tyler the Great Warrior. It was made for a boy named Tyler Gressle via the Make-a-Wish Foundation. There is only one copy of this card in the world and Tyler is in possesion of it. It was publicly announced that it is not for sale.
Tyler the Great Warrior
This monster cannot be Special Summoned. When this card destroys a monster as a result of battle and sends it to the Graveyard, inflict damage to your opponent's Life Points equal to the ATK of the destroyed monster.
"Tyler Gressle, 14, knows a lot about being a warrior. In October 2002, he was diagnosed with undifferentiated embryonic sarcoma. It was discovered when he complained of pain. His parents took him to the doctor, then to a surgeon. During surgery, the doctors discovered that the mass had burst, which caused the terrible pain. The surgeon removed 25 percent of Tyler's liver, about 6 inches of large intestine and his gall bladder. Tyler's prognosis was not good. Fortunately, his doctor had seen a case once before and had been successful in treating the patient, his mother said. "After a long, hard battle, Tyler is perfectly healthy now," his mother said. "We want other families to know they can have hope, and wishes do come true." Tyler had another wish fulfilled. The Make-a-Wish Foundation learned of Tyler and his family's battle and gave him the chance to design his own Yu-Gi-Oh! card for 4Kids Entertainment Inc. The foundation's goal is to present each child, along with their family, with a happy experience to help them feel normal in the midst of a difficult time. "All I needed was a pencil and my imagination," Tyler said. His detailed drawing depicts a warrior deflecting an evil monster's terrible weapons. They unveiled the final card on August 5. Tyler and his family were also invited to New York City to meet with officials from 4Kids Entertainment Inc. and were given a tour of the Yu-Gi-Oh! facility."