Protecting your commander deck and other valuable cards is a top priority, and thats where the ultimate guard MTG deck box comes into play
Most hydras in Magic suffer from the dies to Doom Blade syndrome, meaning that theyre blanked by removal that says destroy or exile. Many hydras are thus Limited bombs, but hard to make work in a Constructed deck
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[3] If this card is Tributed by an effect: You can add any number of banished "Nekroz" cards with different names to your hand
Gallery and List of Powerstone Cards Arbalest Engineers Argothian Opportunist Ashnod, Flesh Mechanist Cityscape Leveler Excavation Explosion Fallaji Excavation Geology Enthusiast Gix's Caress Great Desert Prospector Hall of Tagsin Horned Stoneseeker Junkyard Genius Karn, Living Legacy Koilos Roc Mishra, Lost to Phyrexia Powerstone Engineer Repair and Recharge Sarinth Greatwurm Sibling Rivalry Slagstone Refinery Splitting the Powerstone Static Net Stern Lesson Stone Retrieval Unit Terisiare's Devastation The Brothers' War The Mana Rig Thran Spider Urza, Powerstone Prodigy Urza's Command Visions of Phyrexia Wreck Hunter Note that The Mightstone and Weakstone also has the powerstone subtype, but isn't an artifact token
Or its the tempo flying creature with the Curious Obsession on it