Cards like Unruly Catapult, Galvanic Juggernaut, Traxos, Scourge of Kroog, Staff of Compleation, Bender's Waterskin, and the game changer, Mana Vault all have ways to untap themselves
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As the Final Fantasy x Magic: The Gathering crossover heavily featured the summon mechanic as Enchantments, there are several cards focused on bringing them out, keeping them on the field, or returning them from the graveyard
A little self-mill or an alternate use for cards like Entomb in your Ghen, Arcanum Weaver deck and you can really start doing some things
Blue mages received quite the options from Hour of Devastation