It's only attack Solar Beam does 70 energy, but again its ability increases its value in battles
(It's an artifact with ", Sacrifice this token: Add one mana of any color.") Gadrak can't attack unless you control four or more artifacts
Even without a voltron player at the table, whens the last time you had a game without Lightning Greaves, Swiftfoot Boots, Shadowspear, or any of the Sword of cards getting played
The classic here is the Vineyard from Tempest that gave everyone two Green mana, and then it was played in Standard since mana burn was a thing to kill those who couldn't use it
While the Future Sight frame was busy providing the first foils for a handful of cards, the rare and mythic rare sheet was busy going the other way
Creatures offer a lot of card quality in the cube as well