Helm is great, but I've chosen a different theme for this upgrade path
Add trample and haste on top, and youve got a saga creature that ends games fast
If you happen to have two of the Duck nephews in your starting hand, especially if one of them is Huey, it might be worth it to throw everything else away to look for the third duck
Morph, Space Goo Emerald is already considered one of the best colours to play if you like using Lorcanas Floodborn Shift mechanic, which is the ability to play character cards for cheaper by putting them on top of a character with the same name that you already have in play
Dreamborn , reimagined by the Illumineer
Or maybe you just run a deck that has a lot of cheaper characters which you flood onto the board and then challenge with them all in one turn for a big burst of lore