And since he has first strike, Raiyuu himself is likely to be your best option for a samurai to attack alone
It makes every game feel more controlled and less random
For example, if Clive's Hideaway's hideaway ability is copied and two cards are exiled, you may cast both exiled cards without paying their mana costs (assuming you control four or more legendary creatures at that time.) Gogo's ability can copy any activated or triggered ability on the stack, not just one with targets
Blue Blue has great common creatures, some good tempo spells, and weak removal
Frasier adds that they have a lovely bromance occurring throughout the set, and Casey is the only person/card to make Raphael seem reasonable by comparison
Tymna the Weaver [Best Combat Card Draw Partner] Tymna the Weaver sits among the best Partner Commanders MTG because she turns early combat pressure into steady card access