Sieges have an additional intrinsic ability
(It's an artifact with ", , Discard a card, Sacrifice this token: Draw a card.") Lifelink Whenever a creature an opponent controls dies, you gain 1 life and create a Blood token
Blue has some other notables like Moonsnare Prototype (great at enabling Winter Orb), Mnemonic Sphere (Japanese eggs really are the best), and Tezzeret, Betrayer of Flesh, but theyre a little more niche than what weve covered so far
Combine that with tap-untap triggers and you've got a machine that controls tempo, locks resources, and wins wars of attrition
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Youre not going to want to reanimate on the second turn anyway necessarily (as we dont yet have the mana to pay for Nicol Bolas upkeep, nor do we have the mana to hold up blue mana to shield Deep Spawn should we find that to Animate Dead)