The creatures gain trample until end of turn, as is the case with all other effects that say "gain [ability] and get ... until end of turn" (see also Berserk and Garruk, the Veil-Cursed).
Continuous effects that aren't from static abilities always have a stated duration. Before the introduction of emblems, this was seen on some cards with "... for the rest of the game." You can infer that Craterhoof's instructions are meant to compound onto the single "until end of turn" because the provision of trample must have a duration.
but effects that change the text of spells or permanents generally have an implicitly indefinite duration. Therefore the general case of figuring out the duration in a compound sentence structure is more arcane.
I know that Magic has established by now a bit of a history of putting the duration of such compound effects first (i.e., "Until end of turn, [decorate a thing] and [decorate also a thing]"). The reason for Craterhoof and Garruk to differ is unclear. peteroupc is right, but cantspeak isn't wrong about the wording choice being mystifying.
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Continuous effects that aren't from static abilities always have a stated duration. Before the introduction of emblems, this was seen on some cards with "... for the rest of the game." You can infer that Craterhoof's instructions are meant to compound onto the single "until end of turn" because the provision of trample must have a duration.
but effects that change the text of spells or permanents generally have an implicitly indefinite duration. Therefore the general case of figuring out the duration in a compound sentence structure is more arcane.
I know that Magic has established by now a bit of a history of putting the duration of such compound effects first (i.e., "Until end of turn, [decorate a thing] and [decorate also a thing]"). The reason for Craterhoof and Garruk to differ is unclear. peteroupc is right, but cantspeak isn't wrong about the wording choice being mystifying.
Unfortunately, the reason why a card is worded one way and not another, especially where one wording is alleged to be ambiguous, is a question only Magic R&D can answer. Indeed, as of Hour of Devastation, four cards (Fatal Frenzy, Overwhelming Stampede, Appeal to Authority, and Strength in Numbers), do use the form "Until end of turn, ... gains ... and gets ...", but those are the only ones as of that set. Moreover, although the form "gains ... and gets ... until end of turn" occurs in only four other cards (besides the cards already mentioned) I've found as of Hour of Devastation (Dragon Throne of Tarkir, Pathbreaker Ibex, Surge of Strength, and Xenagos, God of Revels), the form "gets ... and gains ... until end of turn", which occurs in many, many more cards, also suffers from this issue.
EDIT (Mar. 22): Correction.
EDIT (Jul. 26): Edited post to account for Hour of Devastation.
EDIT (Dec. 22): Clarification.
EDIT (Sep. 19, 2018): Correction.
but effects that change the text of spells or permanents generally have an implicitly indefinite duration. Therefore the general case of figuring out the duration in a compound sentence structure is more arcane.
I know that Magic has established by now a bit of a history of putting the duration of such compound effects first (i.e., "Until end of turn, [decorate a thing] and [decorate also a thing]"). The reason for Craterhoof and Garruk to differ is unclear. peteroupc is right, but cantspeak isn't wrong about the wording choice being mystifying.
Awesome avatar provided by Krashbot @ [Epic Graphics].
Unfortunately, the reason why a card is worded one way and not another, especially where one wording is alleged to be ambiguous, is a question only Magic R&D can answer. Indeed, as of Hour of Devastation, four cards (Fatal Frenzy, Overwhelming Stampede, Appeal to Authority, and Strength in Numbers), do use the form "Until end of turn, ... gains ... and gets ...", but those are the only ones as of that set. Moreover, although the form "gains ... and gets ... until end of turn" occurs in only four other cards (besides the cards already mentioned) I've found as of Hour of Devastation (Dragon Throne of Tarkir, Pathbreaker Ibex, Surge of Strength, and Xenagos, God of Revels), the form "gets ... and gains ... until end of turn", which occurs in many, many more cards, also suffers from this issue.
EDIT (Mar. 22): Correction.
EDIT (Jul. 26): Edited post to account for Hour of Devastation.
EDIT (Dec. 22): Clarification.
EDIT (Sep. 19, 2018): Correction.