Lethal damage and effects that say "destroy" won't cause Darksteel Juggernaut to be put into the graveyard. However, it can be put into the graveyard for a number of other reasons. The most likely reasons are if its toughness is 0 or less or it's sacrificed.
The first ability works in all zones.
Since Darksteel Juggernaut is itself an artifact, its power and toughness will always be at least 1 while it's on the battlefield (unless a spell or ability somehow changes its card type).
Last observed on Scryfall 2 months ago at $1.37. Over the trailing 90 days the price moved between $0.45 and $1.40 across 56 observations. Cross-checked across TCGplayer, eBay sold, Cardmarket EU, and Star City.
This printing is one of 2 catalogued treatments from C18 — the lineup includes Nonfoil alongside the standard finish. Across our catalog the Rarix library tracks every variant in the same family so collectors can compare price, scarcity and demand inside a single lineage.
Card #202 of *Commander 2018*, the set that shipped alongside the August 2018 Commander 2018 release.
Card type: Artifact Creature — Juggernaut, printed at rare. Rares occupy the bottom-of-pack rare slot in standard boosters. Mana cost: {5} (5 converted). Keyword abilities: Indestructible.
Legal in Modern, Legacy, Vintage, and Commander.
EDHrec ranks this card #4,716 in Commander, putting it in the niche-pick tier of the format's playable pool.
Illustrated by Randis Albion. Rarix catalogs 22 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Randis Albion
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
If, during your declare attackers step, Darksteel Juggernaut is tapped, is affected by a spell or ability that says it can't attack, or is affected by "summoning sickness," then it doesn't attack. If there's a cost associated with having Darksteel Juggernaut attack, you aren't forced to pay that cost, so it doesn't have to attack in that case either.
