Vizier of Tumbling Sandsutility$0.24Repeated untap engine that can target itself or other permanents, functioning similarly as a cheap reusable untapper in blue-based combo shells.
Aphetto Alchemistutility$1.79A classic repeatable untapper that can untap itself for {1} and also other permanents, offering a similar tap/untap utility role.
Drumbellowerutility$13.19Provides ongoing untap utility across your creatures during each other player's untap step, serving a similar purpose as a reusable untap enabler.
Freed from the Realutility$7.31Enchantment-based untap engine that can repeatedly untap a creature for {U}, very close to Horseshoe Crab's self-untap function.
Pemmin's Aurautility$11.51Like Freed from the Real, it grants repeatable untap functionality and can also add protection or evasion, making it a stronger version of the same combo role.
Magewright's Stoneutility$9.08Reusable untap artifact for creatures with tap abilities, often filling the same combo-support role as Horseshoe Crab in blue utility decks.
Fatestitcherutility$0.63A blue creature with a built-in untap ability that can repeatedly untap permanents, serving a similar function in tap/untap engines.
Toils of Night and Dayutility$0.18Offers repeatable untap value in blue by allowing a permanent to be untapped whenever you cast spells, functioning as a combo enabler.