These two decks are working toward two very different goals, and yet both will run Bebe's Search, Roseanne's Research, and Luxury Ball, often in the same quantity (though in this example, Kingdra will typically run more Luxury Ball than Flygon) because both decks need to get Pokemon and energy into play in order to function
For Item cards, copies of Pok Ball, Potion, and X Speed are essential in supporting you in the battle for searching your deck for basic Pokmon, healing, and lowering retreat costs
That $0.30 flat fee is brutal on $1-$2 cards
The only thing you have to watch out for is having enough black mana producing lands to cast Darkblast multiple times in a single turn
Now this card is also a Titan and there is support for a Titan tribal deck this set, but I don't expect that deck to be very good
Its a slightly cheaper Grim Hireling with a way to convert those treasures into impulse draw