Karlach, Fury of Avernus 

Legendary Creature — Tiefling Barbarian
$16.67 #1054 0.61 4.2 years
Whenever you attack, if it's the first combat phase of the turn, untap all attacking creatures. They gain first strike until end of turn. After this phase, there is an additional combat phase.
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Cards similar to Karlach, Fury of Avernus expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Relentless Assault83%
$2.19↓#1556↓0.5129.6 years↑
"Untap all creatures that attacked this turn. After this main phase, there is an additional combat phase followed by an additional main phase."
Finest Hour82%
$0.81↓#8538↓0.40↓17.3 years↑
"Whenever a creature you control attacks alone, if it's the first combat phase of the turn, untap that creature. After this phase, there is an additional combat phase."
Raph & Leo, Sibling Rivals80%
$0.79↓#9035↓0.00↓0.5 years↓
"Whenever this card attack, if it's the first combat phase of the turn, untap one or two target attacking creatures. After this phase, there is an additional combat phase."
Hexplate Wallbreaker80%
$6.69↓#3547↓0.31↓3.6 years
"Whenever equipped creature attacks, if it's the first combat phase of the turn, untap each attacking creature. After this phase, there is an additional combat phase."
Genji Glove80%
$10.89↓#11160.49↓1.2 years↓
"Whenever equipped creature attacks, if it's the first combat phase of the turn, untap it. After this phase, there is an additional combat phase."
Aurelia, the Warleader79%
$3.07↓#822↑0.6713.6 years↑
"Whenever this card attacks for the first time each turn, untap all creatures you control. After this phase, there is an additional combat phase."