They're about to be sacrificed
But the synergies here get crazy fast: any board wipe that destroys all nonland permanents, like Hour of Revelation, no longer hit your own creatures, and cards that increase the amount of mana your lands tap for, like Nissa, Who Shakes the World grant you ludicrous amounts of mana
"If we listen to each other's heart (Oh yeah) we'll find we're never too far apart And maybe love is the reason why For the first time ever we're seeing it eye to eye" -Powerline Disney Lorcana: Fabled Excellent Fabled changes the game with set rotations and new card rarities
FINAL FANTASY: BLUE Edgar, King of Figaro is just a six mana hand refill in any kind of deck that generates a lot of artifacts, whether that be Thopters, Food, or Constructs
Galadhrim Brigade has the squad mechanic, so you can generate a lot of mana with your elves like Priest of Titania or Marwyn, the Nurturer and drop a bunch of elf lords in a single turn