Legendary Artifact Creature â Construct
Traxos, Scourge of Kroog enters the battlefield tapped and doesn't untap during your untap step.
Whenever you cast a historic spell, untap Traxos. (Artifacts, legendaries, and Sagas are historic.)
Some abilities trigger â€œwhenever you cast a historic spell.â€ Such an ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
Lands are never cast, so abilities that trigger â€œwhenever you cast a historic spellâ€ wonâ€™t trigger if you play a legendary land. They also wonâ€™t trigger if a card on the battlefield transforms into a legendary land, as the Ixalan and Rivals of Ixalan double-faced cards do.
An ability that triggers â€œwhenever you cast a historic spellâ€ doesnâ€™t trigger if a historic card is put onto the battlefield without being cast.
A card, spell, or permanent is historic if it has the legendary supertype, the artifact card type, or the Saga subtype. Having two of those qualities doesnâ€™t make an object more historic than another or provide an additional bonusâ€”an object either is historic or it isnâ€™t.