In terms of gameplay, blue is the technical color, usually having means to extend their plays by gaining memory and card draw, and will usually have a means to add extra attacks through unsuspending and replaying Digimon from their own sources
Why this is a good card to keep in your deck is that there are many characters, items, and actions that allow you to look at your top card, or cards, and return them to the deck
The reason I avoided the colored deck sleeves is because the back of the sleeves are matte textured and seem a bit abrasive, so you would have to use an inner sleeve when sleeving mint cards
Im not buying though
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If your deck already has ways to ramp, Sword of the Animist might be overkill