Box expected value is negative at launch
Farseek Farseek is great for mana fixing
The best blue creatures often have low casting costs, allowing you to save mana for the rest of your spells and get them onto the battlefield early
Kaito, Bane of Nightmares Two generic, one blue, one black legendary Planeswalker Ninjutsu: One generic, one blue, one black (One generic, one blue, one black, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) During your turn, as long as Kaito has one or more loyalty counters on him, he's a 3/4 Ninja creature and has hexproof
Icatian Scout (Hidden Gem) I might be letting my draft-focused brain get the better of me here, but hear me out
If you do, search your library for an artifact card with mana value equal to 1 plus the sacrificed artifact's mana value, put it onto the battlefield tapped, then shuffle