Raiyuu will trigger twice if a Samurai attacks alone
If you've got the ability to play another cheap Fortisphere or Pawpsicle, you can continue the combo by questing with Hiram next turn, further exacerbating the advantage given
Fact or Fiction is the classic, and to my mind fair, draw spell

1 Davros, Dalek Creator 1 Missy 1 Auton Soldier 1 The Flood of Mars 1 Cyber Conversion 1 Hunted by The Family 1 Dalek Drone 1 Vashta Nerada 1 Time Reaper 1 Doomsday Confluence 1 The Toymaker's Trap 1 Vislor Turlough 1 Genesis of the Daleks 1 This Is How It Ends 1 Death in Heaven 1 Delete 1 Ensnared by the Mara 1 Day of the Moon 1 The Master, Multiplied 1 The Master, Mesmerist 1 Rassilon, the War President 1 The Master, Gallifrey's End 1 The Valeyard 1 Weeping Angel 1 The Beast, Deathless Prince 1 The Rani 1 Sycorax Commander 1 The Cyber-Controller 1 Cult of Skaro 1 The Dalek Emperor 1 Ashad, the Lone Cyberman 1 Blink 1 The Master, Formed Anew 1 Cybermen Squadron 1 Cybership 1 Wound Reflection 1 Blasphemous Act 1 Solemn Simulacrum 1 The Sound of Drums 1 River of Tears 1 Foreboding Ruins 1 Shadowblood Ridge 1 Smoldering Marsh 1 Temple of Deceit 1 Choked Estuary 1 Sunken Hollow 1 Darkwater Catacombs 1 Fetid Pools 1 Temple of Malice 1 Canyon Slough 1 Exotic Orchard 1 Temple of Epiphany 1 Frostboil Snarl 1 Stormcarved Coast 1 Fiery Islet 1 Lavaclaw Reaches 1 Shipwreck Marsh 1 Drowned Catacomb 1 Haunted Ridge 1 Dragonskull Summit 1 Creeping Tar Pit 1 Gallifrey Council Chamber 1 Renegade Silent 1 Zygon Infiltrator 1 Don't Blink 1 Exterminate

Additionally, it can transfer a significant amount of power onto an evasive creature, even without any specific synergies, turning that creature into a game-ending threat