1 in every 4 packs (give or take) contains a 13th card from this special list of cards in place of an advertisement or token within the pack (not counted in the 12 cards), and while some are dud commons that tie in with a sets theme, others can be quite valuable
Versions of this deck that play Shining Angel are often referred to as Angel Chaos, and the versions that eschew it for Skilled White Magician are called Skilled White Chaos or just Skilled Chaos. Chaos Control Strategy Chaos Control is an attrition-based deck that intends to answer whatever monsters the opponent throws at it with cards like Metamorphosis (for Thousand-Eyes Restrict) and Chaos Sorcerer
Blessed by Keiga, the Tide Star, Kiki-Jiki would one day master the art of duplication
On that note, let's remind everyone of how the game resolves support effects
The combo we're assembling is Niv-Mizzet, Parun + either Curiosity / Tandem Lookout / Ophidian Eye
Cards with token-generating effects that were not hard once-per-turn effects were able to create insurmountable end boards because of their ability to make endless material