Also, watch out for chances to use this post-combat after something has been damaged to finish off threats outside of the 5/5 range
For the low, low cost of one card, you get to attack again, draw a card, and use all of your mana a second time, plus get a crack at additional upkeep/end step triggered abilities and all that good stuff
This means you can put him down on the board to earn a lore, then quest with him next turn for another lore, before having a character like Madam Mim, Snake enter play to bounce him back to your hand, earning you yet another lore
The general wisdom surrounding Gilded Lotus is that, if you can do something that turn with the mana you can tap it for, then its a worthwhile play
Hajar can run Bard Class as a secret Commander, and let me tell you if you build around RG legends specifically, this little enchantment can put some serious work in