Each color gets a strong, four-mana, cost-reducing artifact with a six-mana activated ability
*Note that Curse of Oblivion, Curse of Death's Hold, Falkenrath Noble, Rage Thrower, Selhoff Occultist, Purify the Grave, and Nevermore are also able to neutralize Spider Spawningjust less reliably than a dedicated board sweeper or a counterspell can
Obviously, you've really got to have the checks and shocks since we're playing three colors
This is the standard playing card size used by Pokmon and Magic: The Gathering
The first 204 cards also have Foil versions, which are just one per pack unless its replaced by one of the scarce Enchanted cards
You could use the Nautilus offensively, enchanting an opponents creature to make it easier to kill