Even a simple +1 from Chandra, Torch of Defiance can mean more cards and more damage
Introduces the "Aroma", "Dracoslayer", "Igknight", and "Performage" archetypes
Any such creature that is a good Regrowth or flicker target also has good value as a spirit commander
Desynchronization keeps your legendary permanents (plus some artifacts and sagas) around while stripping your opponents of resources
Other than collectors who sleeve every game they own to keep them pristine, you might want to sleeve a game where the cards aren't the best quality but you love the game and it gets played a lot, or perhaps you have picked up a game second hand and some of the cards are damaged so you want to use solid sleeves to stop people seeing damage on a certain card
(You can only gain this effect once per turn.) When this card is Normal Summoned: You can target 1 Level 4 or lower Normal Monster, or Level 4 or lower "Magikey" monster, in your GY