Gruul colors let you access most of the werewolves that have been printed, and Tovolar gives you extra ways to turn the day to night
To tell them apart from regular creatures or enchantments, saga creatures have a new card frame, and they have a box at the bottom with either flavor text (like Summon: Primal Odin) or extra abilities (such as flying for Summon: Bahamut)
Some can special summon themselves when a Synchro monster or a monster of a specific level is on the field such as Creation Resonator , so it helps to get the Resonators you want late-game out of your deck and into your graveyard as quickly as possible
If heads, prevent all effects of an attack, including damage, done to its gold during your opponent's next turn
(2017-08-25) If your untap step is somehow skipped as your next turn begins, your phased-out permanents won't phase in until the next untap step you actually have, but you'll no longer have protection from everything and your life total can change again
For the English release, all but one of these cards was released under a subset called Galarian Gallery which has its own numbering system