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Equivalent cards (colorless, mana ramp, artifact-to-artifact transformation):
1. Liquimetal Coating – Same type-changing ability, taps to turn a permanent into an artifact.
2. Liquimetal Floe – Similar ability, makes lands into artifacts.
3. Voltaic Key – Not exactly the same, but interacts with artifacts via untap.
4. Mind Stone – Colorless, mana ramp.
5. Guardian Idol – Mana rock, can animate into a creature.
Reason: All are colorless artifacts, provide ramp or interact with artifacts similarly.
