2019-10-04 : An effect may refer to a card, spell, or permanent that “has an Adventure.” This refers to a card, spell, or permanent that has an adventurer card's set of alternative characteristics, even if they're not being used and even if that card was never cast as an Adventure.

2019-10-04 : Garenbrig Squire's ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered.

2019-10-04 : If an effect refers to a creature card, creature spell, or creature that has an Adventure, it won't find an instant or sorcery spell on the stack that's been cast as an Adventure.