White Auracite (great) White Auracite is an unusual Stormplain Detainment variant, as its more expensive but also acts as a mana rock
Also nifty in a certain Future Sight deck that another esteemed writer on this site swears by 9) Constant Mists Just three words
An artifact's mana value is determined solely by the mana symbols printed in its upper right corner (unless that artifact is the back face of a double-faced card, is a melded permanent, or is copying something else
Cards like "Ancient Grudge" for artifact removal, "Negate" for countering spells, or even "Pithing Needle" to shut down specific abilities can help you respond to different forms of counterplay
Either way, you get an attack trigger, not a combat damage trigger, so even if you lose Locke its not the end of the world if you were just digging for some treasure