Lorcan, Warlock Collector's second ability looks only at the type the card has in the graveyard, not the type it had in any other zone. For example, animated lands dying won't cause the ability to trigger. The opposite is also true. For example, if a creature that was cast as an Adventure is countered, it's a creature card in the graveyard and the triggered ability will trigger.

Lorcan's last ability affects all Warlocks you control, not only ones he collected from an opponent's graveyard.