Gnat Miser
Creature — Rat Shaman
Each opponent's maximum hand size is reduced by one.
Nezumi insect-shamans enjoyed solitary lives, which was fortunate since no other nezumi could stand to live within half a mile of their foul stench.
Thomas M. Baxa
Rulings
If multiple effects modify a player's hand size, apply them in timestamp order. For example, if you put Cursed Rack (an artifact that sets a chosen player's maximum hand size to four) onto the battlefield choosing your opponent and then put Gnat Miser onto the battlefield, your opponent will have a maximum hand size of three. However, if those permanents entered in the opposite order, your opponent's maximum hand size would be four.
(wotc • 2009-10-01)
Rulings
If multiple effects modify a player's hand size, apply them in timestamp order. For example, if you put Cursed Rack (an artifact that sets a chosen player's maximum hand size to four) onto the battlefield choosing your opponent and then put Gnat Miser onto the battlefield, your opponent will have a maximum hand size of three. However, if those permanents entered in the opposite order, your opponent's maximum hand size would be four.
(wotc • 2009-10-01)