4RM3D;n9260191 said:
That's because the card itself doesn't create a huge power-swing (or some insane RNG). So, 'casual' users just tend to ignore it and rather complain about Igni or BTM which can be the turning point of the game. Igni and such is trouble on it's own, while Celaeno Harpy needs to be combined with something else to make it powerful. The same users also say Grave Hag is an issue. But the card itself is fine, instead the archetype supporting the card might be broken.
The card is undoubtedly a swiss army knife though, and probably the best one in the game. It factors into some part of each monsters archetype (consume-extra strength, swarm-3 tokens 1 bronze, wild hunt/weather control-carryover), and it brings something to the table whether its countered or interacted with or not. The only hard counters, by the way, are a NG silver or Radovid-a leader or a silver-and they only counter one copy. I understand Gigni and BTM wil lose you games sometimes, but I honestly think harpy is one of the cards causing monsters to be everywhere. Gigni is also often a round 3 dead card and BTM is countered (or at least left in Lady Luck's hands) as many factions have 1 str units to disable this card from automatically favoring its user.
The real problem, and the point I'll disagree on, is that celaeno does not need something else to be powerful. Play it in round 1 and if left alone it nets you 5 points one round and 6 the next. That's an 11 point bronze with 0 interactions... This card is probably the biggest reason grave hag can be hard to deal with. Obviously the thing with grave hag is that in low level play you don't see it coming, so if you have last say and don't have a counter its a large swing. In high end play its just a matter of getting last say and having some kind of counter in your deck (pretty common these days), but with 1 harpy played in round 1 you're likely to have to spend a decently high strength unit to win round 2 if they pass with the harpy carryover on the board, and if multiple harpies are played in round 1 its likely that the opponent will have to spend more than 1 card to win the round or won't be able to insta-pass for advantage were they to win round 1. It just completely enables the grave hag, and doesn't need any interaction to do so.
Now if it is interacted with the card is three tokens for butt/yen swarm, an instant thunderbolt setup, a consume staple, and as already stated is tons of carryover. There are no serious monster decks I've seen lately that don't include three copies of this card. The only "problem" with this card is that it is relatively low tempo initially, but unless hard countered it exchanges carryover for tempo anyways.
I know the "nerf monsters" camp is largely sort of tied between talking about foglets and celaeno's, but for me the answer is clear. Foglets provide a great tool in the kit of swarm/weather gameplay, but they are nowhere near the same kind of utility as celaeno. The card is useful no matter what you do with it (or don't do with it, as just playing it is an 11 overall value bronze),a nd provides value no matter what.
TLDR: The card does a lot with no interaction, and with interaction does almost everything.