Sol Ring is a legal card, so using Ancient Tomb isnt really a big deal
This is typically a blue ability, with cards like Sleep and Assassin Gauntlet, though white gets in on the fun with Blinding Light, Bond of Discipline, and a few others
1 Skysovereign, Consul Flagship
The way they grayscaled the cards didn't help either, looking dark and murky, especially when compared to mockups made by others, like this one a friend of mine shared on Twitter: Someone in my server took the 20 seconds to up the brightness just a bit and look at the difference it made
(Of course, like Tarmogoyf, if it turns out you don't actually need that support, feel free to take it out!) And third, when it looks like something is powerful, don't be afraid to try it in places it wouldn't "normally" go
I think Nissa, Vastwood Seer will come back in a big way now that its no longer competing with Courser of Kruphix for the three-mana slot that nets land(s)