Traxos, Scourge of Kroog 
Legendary Artifact Creature — Construct
Trample
Traxos enters tapped and doesn't untap during your untap step.
Whenever you cast a historic spell, untap Traxos. (Artifacts, legendaries, and Sagas are historic.)
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Cards that do something similar 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.
Grimgrin, Corpse-Born 100%
$3.76#5825
"this card enters tapped and doesn't untap during your untap step."
Rona, Herald of Invasion // Rona, Tolarian Obliterator 90%
$1.96#3441
"Whenever you cast a legendary spell, untap this card."
The Blackstaff of Waterdeep 86%
$0.20#19806
"You may choose not to untap this card during your untap step."
Saint Traft and Rem Karolus 86%
$0.25#13710
"Whenever you cast a spell that has convoke, untap this card."
Raphael, Tag Team Tough 84%
$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."
Godo, Bandit Warlord 83%
$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."
Quest for Renewal 82%
$5.19#3395
"As long as there are four or more quest counters on this enchantment, untap all creatures you control during each other player's untap step."
Ashnod's Battle Gear 82%
$0.20#30335
"You may choose not to untap this artifact during your untap step."
Vedalken Shackles 82%
$7.66#11447
"You may choose not to untap this artifact during your untap step."