You may play one more card in this turn.
Hyper
Branch Expansion Strategy: Turn all your cards, including this one, into "Rbit Hobby Shop". You may play one more card this turn.
Rbit Hobby Shop: Pay X stars to the player who set this card, where X is the Lvl of the player who set this card. Draw a card from the deck. This card remains on board when triggered but can be replaced by a new trap. No effect on the player who set this trap.
Strategy
Arthur's hyper is his main, if not only, form of strategic play. 
Branch Expansion Strategy turns his entire hand into 
Rbit Hobby Shop, which is then placed around the board, like a normal trap card. Unlike a normal trap, however, this one does not disappear after being triggered; it remains on the board until the game ends, or until it's replaced or destroyed.
Much like when playing , it is advised that the player wait to use their hyper until they have a full hand, to maximize the amount of Shops. As the stars he steals are directly related to both his Level and the number of Shops on the field, Arthur should focus on setting as many Shops as possible, starting with 
Home panels to ensure that no other player can Norma without payment, and going from there. If you're going to be forced to discard as a result of the field event, or cards like 
Present for You that force you to draw cards, one should place a Shop regardless of one's current panel.
Effectively, the trap forces players who trigger it to pay Arthur to draw a card. While the amount of stars stolen per trigger may seem rather minuscule at first, it only increases as the game goes on and Arthur gains more Levels and places more and more Shops, as the function of the Hobby Shops work in direct conjuncture with Arthur's passive. In late game, it can be dangerously effective at preventing other players from achieving Normas.