The Enhanced Booster Box is slightly different from a standard option, specifically as it includes a Mega Evolution Stamped Bulbasaur Illustration Rare
This prevents them from using Loading
You can also reset this negation effect with its 3 rd effect: which allows you to return it to the extra deck and special summon any level 9 or lower monster from your graveyard
Its also why you cant wait to see what card is being named by effects like Nevermore or Pithing Needle and then try and use the named card in response the choice of name becomes part of them entering the battlefield and the restriction is already applied before anyone gets priority
Extra Deck 15 Gullveig of the Nordic Ascendant X LIGHT Link 1 [ Fairy / LinkEffect ] ATK 800 DEF - 1 Level 5 or lower "Nordic" monster If this card is Link Summoned: You can banish up to 3 cards from your hand and/or field, and if you do, Special Summon that many "Nordic" monsters from your Deck in Defense Position, also, for the rest of this turn, you cannot Special Summon monsters, except "Aesir" monsters, nor Normal Summon/Set any monsters