The latest one, Fairy type was introduced in Generation VI (Pokmon X & Y) to balance the Dragon and Dark types
Earlier sets have likely been excluded for mechanical reasons, ranging from the era of Pok-powers and Pok-bodies to archaic rulings
Lost to Legend Lost to Legend is an easy way to get rid of commanders that arent hexproof creatures
Caltrops Caltrops is normally not a special card, but in a Maha deck, it completely shuts down your opponents' ability to attack
Only cards with this special symbol may be used for Speed Dueling, however players are free to Duel with Speed Dueling cards in regular Yu-Gi-Oh
Festival, Moment of Silence, False Peace, Empty City Ruse I dont think Ive ever put four cards that do roughly the same thing back to back in this article series