If this card is Normal or Special Summoned: You can target 1 face-up monster your opponent controls; negate its effects. When your opponent activates a card or effect (Quick Effect): You can shuffle this card from the field into the Deck, and if you do, Special Summon 1 "Blue-Eyes White Dragon" from your Deck. You can only use each effect of "Blue-Eyes Solid Dragon" once per turn.
On Yugipedia this card only says "shuffle this card into the Deck" for its quick effect. So I ask, does that mean that it can be shuffled from the graveyard into the deck for negation or does it have to be from the field?
They're talking about decider being unable to be attacked by high level monsters
I've decided to put this card in my Blue Eyes deck. Even if it can"t be summon as easily as Spirit et White Dragon (not a normal monster), you still have 3 Protectors with Eyes of Blue, 2 Spirits and the combo "Majesty with Eyes of Blue + Silver Cry" to summon it. That's 7 ways to summon it. And it's protection effect is better than Spirit (you can search BEWD in your deck).