Farseek Farseek is great for mana fixing
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
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
Mayael the Anima likewise can start getting huge fatties off the top of your library straight into your opponents noggin
Boosters are shipped randomly