I couldn't find an answer to this (perhaps because I'm overthinking this), but does Vorel of the Hull Clade's ability count as "putting" counters.
For example: If you had Corpsejack Menace out, and you targeted a creature with 4 +1/+1 counters with Vorel's ability, would you then you then put 8 additional counters on it? My assumption would be 'yes' based on 701.9e, but I figured I'd double check.
701.9e To double the number of a kind of counters on a player or permanent, give that player or permanent as many of those counters as that player or permanent already has.
For example: If you had Corpsejack Menace out, and you targeted a creature with 4 +1/+1 counters with Vorel's ability, would you then you then put 8 additional counters on it? My assumption would be 'yes' based on 701.9e, but I figured I'd double check.
701.9e To double the number of a kind of counters on a player or permanent, give that player or permanent as many of those counters as that player or permanent already has.