The restriction on historic land hurts, but there are some legendary lands and artifact lands to make up for it
As the name implies, Fusion Monsters, especially in the earliest days of the game, were usually a combination of cards used for its summon
Its also great for decks that use ETB and flicker effects
Go to Magic.Wizards.com/Formats for a complete list of formats and their permitted card sets and banned lists
Forbidden Cards Forbidden Mystic Mine X SPELL Field If your opponent controls more monsters than you do, your opponent cannot activate monster effects or declare an attack
Not only does Terror Eater act as a one-sided Rest in Peace, shutting down your opponents graveyard shenanigans while leaving yours intact, but it also turns the cards exiled into a second hand for you