Urabrask is the most generically playable of the three, since you dont need to really build-around Urabrask to get value
Dominarias removal is decent, but theres not a ton of ways to profitably kill a 3 toughness creature without spending 4-5 mana
Each one has an art card, a chance for extra rares, thematically connected commons and uncommonssome even have an interesting card fromMagic'shistory
Of course, it's also banned in Pauper
If Heliod, God of the Sun slowly increased due to Commander demand, the Secret Lair version will likely go along for the ride, but there is little reason to expect any Secret Lair card to end up being worth x5 or x10 its original printing, even in the semi-distant futurethey are just too common
This week, we're heading to Standard to play a deck I've been working on ever since Aetherdrift spoiler season but just finally figured out: Push the Limit