You don't need to draw Spider Spawning for it to win you the game
Rad counters translate to both direct damage and cards milled, so stacking a lot of them on a single opponent can have potentially devastating effects
Of all of the cards in the cycle, I think you might opt for another Orb, but scry 2 can help you dig for your important Dragons
If you don't reveal an Equipment card, or if the exchange can't be completed (such as if Arcanum Things is no longer on the battlefield, you don't own Arcanum Things, or the new Equipment can't be attached to the creature Arcanum Things is attached to), nothing happens
No one buys commander decks for the lands
In these past showcase cards, the metal Viking treatment was only applied to legendary creatures, one legendary artifact and one very special enchantment: The Prismatic Bridge