40 cards where the text includes “morph” and the color identity ≤ G

Aerie Bowmasters (Dragons of Tarkir #170)
Ainok Survivalist (Murders at Karlov Manor Commander #165)
Birchlore Rangers (Onslaught #248)
Branchsnap Lorian (Legions #118)
Broodhatch Nantuko (Murders at Karlov Manor Commander #167)
Deathmist Raptor (Murders at Karlov Manor Commander #168)
Den Protector (Murders at Karlov Manor Commander #169)
Guardian Shield-Bearer (Dragons of Tarkir #189)
Herdchaser Dragon (Dragons of Tarkir #190)
Hooded Hydra (Murders at Karlov Manor Commander #171)
Hystrodon (Onslaught #266)
Kin-Tree Warden (Khans of Tarkir #139)
Krosan Cloudscraper (Murders at Karlov Manor Commander #175)
Krosan Colossus (Murders at Karlov Manor Commander #176)
Metamorphic Wurm (Odyssey #250)
Nantuko Vigilante (Murders at Karlov Manor Commander #177)
Patron of the Wild (Legions #134)
Pine Walker (Khans of Tarkir #143)
Primal Whisperer (Legions #135)
Proteus Machine (Scourge #141)
Root Elemental (Murders at Karlov Manor Commander #182)
Sagu Archer (Khans of Tarkir #146)
Salt Road Ambushers (Murders at Karlov Manor Commander #184)
Segmented Krotiq (Dragons of Tarkir #202)
Serpentine Basilisk (Onslaught #280)
Snarling Undorak (Onslaught #283)
Spitting Gourna (Onslaught #284)
Temur Charger (Khans of Tarkir #153)
Terramorphic Expanse (Outlaws of Thunder Junction Commander #336)
Thelonite Hermit (Murders at Karlov Manor Commander #188)
Titanic Bulvox (Scourge #129)
Towering Baloth (Onslaught #292)
Treespring Lorian (Onslaught #293)
Tribal Forcemage (Legions #142)
Venomspout Brackus (Onslaught #295)
Whetwheel (Future Sight #168)
Witness of the Ages (Khans of Tarkir #228)
Woodcloaker (Scourge #134)
Woolly Loxodon (Masters 25 #195)
Zoetic Cavern (Murders at Karlov Manor Commander #311)

This search is finished. Now the real work can begin.