Vile Germs
Lands often have no use late game in limited, so sacrificing a couple to give yourself a few extra cards never hurt, especially when the additional costs involved "tap" and not "spend mana"
Even outside of that, Culling Ritual is a great tool to get rid of common mana rocks, draw engines like Mystic Remora, as well as any other powerful cards that come into play quickly
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This effect is quite useful as it just simply allows you to see what your opponent is going to draw and will thus give you some hand information if you're able to keep track of what they've drawn and what they've played, which in turn can be good with cards like Mind Crush
You can only use this effect of "Edge Imp Frightfuloid" once per turn