Card Spotlight
A 3-mana Azorius Hero from Marvel Super Heroes with vigilance that untaps each creature you control the first time it becomes tapped during your turn, so every tap ability on your board can be used twice.
Commander Spotlight
Captain America, Living Legend ↗
A 3-mana Azorius Hero from Marvel Super Heroes with vigilance that untaps each creature you control the first time it becomes tapped during your turn, so every tap ability on your board can be used twice.
See Captain America, Living Legend's full stats and printings →
As the commander, repeated access to the untap effect rewards a deck built around tap-ability creatures. Mana dorks and utility creatures can each be used twice on every turn it's on the battlefield.
A strong support piece in any Azorius deck already running creatures with valuable tap abilities, even without building the whole 99 around the effect.
Sol Ring ↗
Not a creature, so this ability doesn't untap it. It still fits a deck built around doubling its mana.
Ornithopter of Paradise ↗
A colorless mana creature. Captain America untaps it the first time it taps on your turn, so it adds two mana each of your turns.
Wall of Omens ↗
A cheap white defender that draws a card when it enters, holding the ground while your other creatures attack.
Any strong utility tap-ability creature ↗
The card doubles abilities a deck already wants to use, so the better the ability, the bigger the payoff.
As a recent-set card, Captain America, Living Legend is inexpensive and a reasonable pickup for an Azorius tap-ability or Hero-tribal deck, with very little financial risk.
Whenever a creature you control becomes tapped during your turn for the first time that turn, untap it. That covers attacking, tapping for a mana ability, or activating a tap ability, so each creature you control can tap twice on your turn.
Any deck relying on creatures with valuable tap abilities, such as mana dorks, tap-for-value creatures, or attackers you also want available as blockers. The once-per-creature untap doubles each of those abilities for the turn.
No. Untapping an attacker doesn't grant an extra combat or let it attack again. The creature is available to block or tap for something else afterward, which is still useful.