You can put up to 15 cards, but in best-of-one youll only have access to 7 cards
Each Saga depicts a former Avatar or Sozin, tying them directly to the lore and worldbuilding of the Avatar: The Last Airbender universe
They feature an assortment of cards at different rarities, including one rare or mythic rare card, which make them perfect for drafting
This was done so that WotC would not have to continue to pay for the use of many arts done for earlier sets, as originally artists were paid royalties for their artwork being used, instead of a flat fee as is done today for new Magic art
Thrulls are canonically created out of dead corpses, so it makes sense, I guess
(They cant be the targets of spells or abilities.) Whenever this creature deals combat damage to a creature, tap that creature and it doesnt untap during its controllers next untap step