Karlach, Fury of Avernus {4}{R}
Legendary Creature — Tiefling Barbarian
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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Reveille Squad 95%
$0.28#17354
"Whenever one or more creatures attack you, if this creature is untapped, you may untap all creatures you control."
Shriekwood Devourer 94%
$0.38#5464
"Whenever you attack with one or more creatures, untap up to X lands, where X is the greatest power among those creatures."
Aurelia, the Warleader 91%
$4.43#820
"Whenever this card attacks for the first time each turn, untap all creatures you control. After this phase, there is an additional combat phase."
Akki Battle Squad 90%
$4.73#3876
"Whenever one or more modified creatures you control attack, untap all modified creatures you control. After this phase, there is an additional combat phase. This ability triggers only once each turn."
Raph & Leo, Sibling Rivals 90%
$0.74#9787
"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."
Melee 90%
$0.33#28941
"Whenever a creature attacks and isn't blocked this combat, untap it and remove it from combat."
Godo, Bandit Warlord 89%
$1.03#3192
"Whenever this card attacks for the first time each turn, untap it and all Samurai you control. After this phase, there is an additional combat phase."
Finest Hour 88%
$1.17#8384
"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."
Scourge of the Throne 88%
$0.39#1277
"Whenever this creature attacks for the first time each turn, if it's attacking the player with the most life or tied for most life, untap all attacking creatures. After this phase, there is an additional combat phase."
+1 more matching line
Jangling Automaton 87%
$0.11#21680
"Whenever this creature attacks, untap all creatures defending player controls."
Raggadragga, Goreguts Boss 87%
$0.22#7103
"Whenever a creature you control with a mana ability attacks, untap it."
Raphael, Tag Team Tough 87%
$6.19#11735
"Whenever this card deals combat damage to a player for the first time each turn, untap all attacking creatures. After this combat phase, there is an additional combat phase."
Copperhorn Scout 87%
$0.27#5520
"Whenever this creature attacks, untap each other creature you control."
Preston Garvey, Minuteman 86%
#12464
"Whenever this card attacks, untap each enchanted permanent you control."
Genji Glove 86%
$8.58#1233
"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."
Hexplate Wallbreaker 86%
$7.69#3483
"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."
Shakedown Heavy 85%
$0.35#6566
"Whenever this creature attacks, defending player may have you draw a card. If they do, untap this creature and remove it from combat."
Full Throttle 85%
$6.07#1495
"At the beginning of each combat this turn, untap all creatures that attacked this turn."