You can Link Summon something from your Extra Deck by sending the same number of monsters that meet the material requirements written in the cards effect box, whose total numbers equal to the LINK number, from the field to the Graveyard Decrease Materials by Using Link Monsters
I love that it also has the late game upside though, where you can cast is for 7, Proliferate Twice which already is quite strong but you also get to draw two cards
If you're like me, you've probably felt that little panic when you open the binder and see that your precious cards are no longer lying flat - they've started to bend like chips
Their playstyle involves Super Roboyarou and Super Robolady switching out with each other when one is on the field while the other is in the Extra Deck, with the two becoming stronger in battle depending on what they target
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)