This skill itself doesn't need nerf. It's just used by three top tier decks (naturia, red eyes and sometimes nephtys) so people thought this skill is broken
Old HHG is broken because it bypass anti-activation spell/trap, for example, opp starts first with Ultimate Providence and some his important trap. Not count +1 card as other field spell and the ability to destroy S/T. Who will counter harpy summoning every times instead of just counter the field once. Not all deck run 3+ spell remover to consistent draw it first few turn.
No 🔥 sherlock, HHG is nowhere broken, the field is just a little bit strong to the meta that time. Now it would be just fine with all the new stronger deck around. The also did a bad job in nerfing it, should be sth like "1/2 per duel: you can shuffle 1 card to the deck/discard 1 card to add 1 HHG to your hand". The -1 your hand for a field that isnt even that strong is just crap.