Some older cards were printed with amass N without including a subtype. Those cards have received errata in the Oracle card reference so that they read “amass Zombies N.”
April 4, 2025 · Tarkir: Dragonstorm
If multiple permanents are instructed to connive at the same time, the first player in APNAP order who controls (or, in the case of a permanent no longer on the battlefield, last controlled; see rule 701.47c) one or more of those permanents chooses one of them and it connives. Then this process is repeated for each remaining instruction to connive.
April 29, 2022 · Streets of New Capenna
If multiple permanents are instructed to connive at the same time, the first player in APNAP order who controls one or more of those permanents chooses one of them and it connives. Then if any permanents remain on the battlefield which have been instructed to connive and have not done so, this process is repeated.