Goblin Haberdasher somehow makes it so that your creatures that are seen wearing a hat get Menace, a very useful ability that forces players to assign at least two creatures to defend against an attacking hat-wearer if they want to avoid damage
I run it in a deck with tons of defensive spells that cost 1-2 mana, because I always expect my opponents to use any removal they have on my Jeskai commander
Interestingly, the Japanese version from the VSTAR Universe set is much more valuable
There are dozens of cards that reward you for playing humans, zombies, or elves, but the cards that reward you for playing lizards or warlocks are very few and far between
The concept of drawing and discard, which a lot of players refer to as looting after Merfolk Looters activated ability, isnt new and most sets make use of this, especially in blue