And then you can use the above
Summoner's Sending and
Lord Jyscal Guado to benefit majorly off of them! I think this set is what pushes me over the edge with +1/+1 counters, and
Shelinda, Yevon Acolyte is a good one to help do that.

My favorite of the +1/+1 counters also overlaps with Legendary-Matters, the above
Ardbert, Warrior of Darkness. What a neat card. I like that he adds two counters if you do play a BW card, though that'll be much less common in Cube.
I am also obsessed with
SNORT. Giving a wheel effect flashback? The dream. Making it a pain for your opponent to join you in spinning the wheel? Lovely.
Some other cards:
The Falcon, Airship Restored
Suuuper medium power but great play pattern. I also will always take a careful look at any card that can be played from the graveyard.
Phoenix Down
Pretty neat. Gettable with
Urza's Saga and
Brightglass Gearhulk. Gets back the Gearhulk! 3 and 4MV dudes these days are good enough that you don't mind spending three mana over two turns to bring one back at the right time, and at instant speed no less! The tapped clause is not an issue -- it's flavorful and lets you get ETB effects at instant speed without also ruining combat math. I only run
19 dudes plus a dozen or so tokens that qualify for the removal half of this, so it's really mostly the first effect. In all seriousness, it's probably not good enough...but only due to the exile. I'm still considering it.

I'm much happier to spend an artifact on this kind of card than a gold card (a la
The Ancient One). It's basically a self-milling
Manalith that becomes a God later in the game...a
Cultivator's Caravan for the modern ages, if you will. I like what this is doing.
Bugenhagen, Wise Elder
We've been spoiled for 2M mana dorks lately. This one is definitely tier 1.5 at best, but it is a legendary creature! And it does draw cards once its main usefulness is complete! And it does block spirit tokens like a champ!! There's a lot going on here....both on the card and in the art.
Hraesvelgr of the First Brood
Now that's good clean fun. Magic how it's supposed to be (other than it being Final Fantasy I guess, but since I barely know this franchise outside of 12 and 15, this looks just as Magic-y to me as the new Takrir elder dragons). Excited for my blue section to be heavy in dragons?
This set is incredible. There are a dozen more cards I want to talk about too!!