Most of my favorites were already mentioned (really happy to see some love for
Soldevi Adnate!), but there's a few left that are still relevant in modern Magic! I love love love the aesthetic of these sets in particular, I think the game lost that sauce after the Mirage block, even if I still do like the next few sets as well.
Steal your opponents' creatures straight from their library...in colorless!
I frequently run this one. Works well with its best buddy
Orcish Lumberjack to help you ramp into a big play early, and plays surprisingly similarly to
Grim Monolith.
White stealing creatures is very funny, and it does it in a white way. I ran this card for a decade and still wish I did now, to be honest, but I run
way too many tokens to justify it.
If you support tokens, this takes a turn to get going but is absolutely absurd once it does. Great in commander for a reason, and has been on-deck in my powerful Cube as well.
Making a Threaten effect have instant speed massively expands the roles it can play. Great blowout potential, and still close to being reasonably costed in powerful environments. This was in my Cube for a decade and still
threatens to come back.
Another founding member of my Cube, there to support the green aggro deck (go
Jungle Lion go!). It's a little mean, but very good.

I like playing these like you'd play Armageddon in a white deck. Basically, you make a tempo/aggro deck in blue where you only need 1mv and 2mv threats, and back them up with counterspells, then you play this as your top end to make sure your opponent can never properly stabilize. They're both on the outside looking in because they're a little too mean to enfranchised players, but I'd love to put Mana Vortex back in, to be honest.
Just a totally fine Magic card.