47 cards where the card types include “arcane” and the color identity ≤ BGW

Blessed Breath (Champions of Kamigawa #1)
Call for Blood (Betrayers of Kamigawa #63)
Candles' Glow (Champions of Kamigawa #5)
Charge Across the Araba (Saviors of Kamigawa #4)
Choice of Damnations (Saviors of Kamigawa #62)
Cleanfall (Champions of Kamigawa #6)
Cranial Extraction (Champions of Kamigawa #105)
Dance of Shadows (Champions of Kamigawa #108)
Death Denied (Ultimate Masters #92)
Death of a Thousand Stings (Saviors of Kamigawa #64)
Devouring Greed (Modern Masters 2015 #78)
Ethereal Haze (Champions of Kamigawa #9)
Feast of Worms (Champions of Kamigawa #207)
Footsteps of the Goryo (Saviors of Kamigawa #68)
Goryo's Vengeance (Ultimate Masters #99)
Hideous Laughter (Champions of Kamigawa #115)
Horobi's Whisper (Modern Masters #88)
Hundred-Talon Strike (Betrayers of Kamigawa #8)
Inner Calm, Outer Strength (Saviors of Kamigawa #133)
Joyous Respite (Champions of Kamigawa #216)
Kodama's Might (Champions of Kamigawa #224)
Kodama's Reach (Outlaws of Thunder Junction Commander #196)
Nourishing Shoal (Ultimate Masters #175)
Otherworldly Journey (Modern Masters 2015 #30)
Plow Through Reito (Saviors of Kamigawa #22)
Pull Under (Champions of Kamigawa #137)
Pure Intentions (Saviors of Kamigawa #25)
Quiet Purity (Champions of Kamigawa #39)
Rend Flesh (Champions of Kamigawa #140)
Rending Vines (Saviors of Kamigawa #143)
Roar of Jukai (Betrayers of Kamigawa #140)
Shining Shoal (Betrayers of Kamigawa #21)
Sickening Shoal (Betrayers of Kamigawa #82)
Sink into Takenuma (Saviors of Kamigawa #89)
Soulless Revival (Champions of Kamigawa #144)
Spiritual Visit (Saviors of Kamigawa #29)
Strength of Cedars (Champions of Kamigawa #245)
Swallowing Plague (Champions of Kamigawa #146)
Terashi's Cry (Champions of Kamigawa #47)
Terashi's Grasp (Modern Masters 2015 #37)
Terashi's Verdict (Betrayers of Kamigawa #27)
Three Tragedies (Betrayers of Kamigawa #87)
Unchecked Growth (Betrayers of Kamigawa #148)
Uproot (Betrayers of Kamigawa #149)
Vital Surge (Betrayers of Kamigawa #150)
Waking Nightmare (Modern Masters 2015 #103)
Wear Away (Champions of Kamigawa #250)

The message was clear to Sorin—time to search for something else.