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Walking Ballistautility$10.63Also uses X in its mana cost to enter with +1/+1 counters and scales into a large artifact threat. It serves a similar modular build-around role, though it trades defender for direct damage utility.Hangarback Walkerutility$0.54Enters with +1/+1 counters based on X and functions as a scalable artifact creature that can grow into a board presence. It plays similarly as an artifact threat that converts mana into counters.Stonecoil Serpentutility$1.52A scalable colorless artifact creature with X in its cost that enters as a larger threat based on mana invested. It has broader combat utility instead of defender, but fills the same flexible X-creature role.Maelstrom ColossusfinisherBudget$0.20A colorless creature with cascade that can be cast for X and functions as a scalable top-end threat. It is less directly counter-based, but shares the big colorless X-spell feel.The Mana Rigutility$0.73A scalable colorless artifact permanent that can convert mana into board advantage in a similar artifact-centric deck shell. It is not a creature, but overlaps in the colorless X-artifact design space.Ulamog's CrusherfinisherBudget$0.22A colorless artifact creature-style threat commonly used as a large scalable finisher in colorless decks. It does not use X, but serves the same 'big colorless creature' function.Walking Atlasutility$1.31A colorless artifact creature with defender-like board utility, though it does not scale with counters. It fits the same low-impact utility artifact creature space in colorless decks.Phyrexian Revokerutility$0.33A colorless artifact creature that fills a similar slot in artifact-heavy decks as a flexible low-cost body. It does not scale, but is a common utility artifact creature alternative.
