In those days, virtually every major tournament was won by Charizard ex, and nothing could put a stop to it except for a bad matchup into the new (at the time) BDIF, Regidrago VSTAR
Balefire Liege, Blinking Spirit, Tradewind Rider, Spirit of the Night, Spirit of the Hearth, Azorius Herald, Bloodghast, Nether Shadow, Nether Spirit, Nether Traitor, Krovikan Horror, Celestial Crusader, all of the Spirit avatars like Demigod of Revenge, Primordial Sage, Dimir Infiltrator, the muse cycle like Windborn Muse and Seedborn Muse, Eternal Dragon, Ghost Council of Orzhova, Guardian of the Guildpact, Swans of Bryn Argoll, Wall of Reverence, Karmic Guide, Midnight Banshee, the Phantom creatures like Phantom Centaur and Phantom Nishoba, the Rusalkas, the Eidolons, both Spirit Guides, Sovereigns of Lost Alara, Spectral Lynx, and, of course, Will-o'-the-Wisp
They are permanents with no regular card representation or casting costs
My personal experience is that people dont play around and experiment with a bunch of different kinds of decks, but rather just stick with the top tier meta decks
It can be a game-ender in a deck full of disruption and control
