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Then if you can get Scuttling Sliver into play, you can tap it for three or more mana, untap it, and tap it again, netting at least one extra mana every time you do it

Maze's End Rarity: Mythic Rare TYPE: Land SUBTYPE: - CMC: 0 Mana cost: USD: $0.38 EUR: 0.66 TIX: 0.02 EDHREC RANK: 2821 This land enters tapped

It provides a true zero-mana option for countering noncreature spells, only costs a single mana more than Negate itself when hardcast, and even exiles the target to boot

Even just tapping for two a turn makes this pretty good, much more is very rare in the cube with a lack of walls but does make this very good