Its a pledge to not reprint a certain number of cards
Every non-Core Set since Arabian Nights, released in December 1993, has an expansion symbol, though the changing of the color for rarity didnt start until Exodus, released in June 1998
Its most effective after your opponents exhaust their removal on your initial threats
But the Elf-themed deck, in particular, may offer some possible long-term growth given the popularity of the tribe
GAMENOOK Base Set (1999 - 2000) Base Set - January 9, 1999 Jungle June 16, 1999 Fossil - October 10, 1999 Base Set 2 - February 24, 2000 Team Rocket - April 24, 2000 Gym Heroes (2000) Gym Heroes - August 14, 2000 Gym Challenge - October 16, 2000 Neo Genesis (2000 - 2002) Neo Genesis - December 16, 2000 Southern Islands - July 31, 2001 Neo Discovery - June 1, 2001 Neo Revelation - September 21, 2001 Neo Destiny - February 28, 2002 Legendary Collection (2002) Legendary Collection - May 24, 2002 E-Card (2002 - 2003) Expedition Base Set - September 15, 2002 Best of Game - December 2002 - July 2003 Aquapolis - January 15, 2003 Skyridge - May 12, 2003 Skyridge was the last Pokmon TCG set to be printed by Wizards of the Coast, ending the "WOTC" period of Pokmon cards