Tom Bombadil becomes better and better the longer Magic releases Sagas, since you want a high density of Sagas in your deck when youre playing Tom.
The fact that the Omens are all Dragons is also relevant for Behold
Lifelink is a great keyword for white to capitalize on
Legality depends on the tournament format -- Edea, Possessed Sorceress Art Series can be legal in some formats and banned or restricted in others
Some wanted the power, others mostly the fame and then money, while others just wanted him cause he was a cool evil dragon
The simplest answer is graveyard hate, with cards like Leyline of the Void, Rest in Peace, and Relic of Progenitus being among the best in the format at fighting Dredge and Surgical Extraction also offering a decent amount of value if you can get the timing right (exiling Narcomoeba or Bloodghast makes it hard for Prized Amalgam to return to the battlefield, while getting rid of Creeping Chill with the "exile" trigger on the stack will fizzle the damage)
