Its a nice balancing act that lets you make bigger plays at a higher cost, which in turn allows your opponent to make bigger plays
The additional twenty cards that it can hold can serve as a perfect space to introduce a sideboard, allowing you to pack your deck and any last-minute modifications it might need based on the match-up
For instance: Creatures (12) Lands (25) Spells (23) Sideboard Turn 1: Thoughtseize or Ancestral Vision Turn 2: Bitterblossom Turn 3: Spellstutter Sprite or Vendilion Clique Turn 4: Mistbind Clique or Cryptic Command Are we having fun yet
5th) Mew-V (Alternative Full Art) (Fusion Strike - 251/264) Of course, its Basic version could not be missing from the list, as well as the VMax version (which we will mention), since the great mascot star of the collection is Mew itself
Its usually something that players prioritize killing, so be prepared to protect it
Not only that, but most structure decks as of late have actually been pretty darn good, containing many cards played competitively