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The second effect is to search for a "Synchron" monster

Include this card in a Torbran, Thane of Red Fell deck to deal 4 damage every time an opponent casts a noncreature spell

They are also direct support for Dark Hole with their monsters being able to search/recur it while also benefitting from being destroyed

Some of the other card art below (like Urza's Avenger) also take the form of what looks like drafts or design blueprints made by Urza (or Mishra), and he Ornithopter design here looks like something that Da Vinci or someone would make

Waters Dual lands are lands that give a player access to two different colors of mana