While the activation cost is relatively high, the ability to tutor for specific Goblin permanents makes Moggcatcher a valuable tool for assembling combos or establishing a formidable board presence
Regardless, having the opportunity to bring up and attack whichever Pokemon you like is a key asset to this deck
(2023-06-16) The trigger event doesn't have to specifically refer to legendary permanents or to artifacts, nor does it have to specifically refer to when something "leaves the battlefield." For example, an ability that triggers "whenever a creature dies" would trigger twice if a legendary creature or an artifact creature dies while Gandalf the White is on the battlefield, as would an ability that triggers "whenever a permanent is put into a graveyard from the battlefield." (2023-06-16) Look at each legendary permanent and each artifact as it exists on the battlefield, taking into account continuous effects, to determine whether any triggered abilities will trigger multiple times
However, the promotion was quickly ended within hours of its launch after scalpers flooded locations to hoard the Pokmon TCG collectibles
But in some ways I think the lack of an announcement adds to the punch-line
Unless the source of the phasing says otherwise (such as with Oubliette), phased permanents phase back in at the start of your next untap step