20 cards where the rarity is equal to common and the text includes “amass”

Aven Eternal (War of the Spark #42)
Callous Dismissal (War of the Spark #44)
Crush Dissent (War of the Spark #47)
Deceive the Messenger (The Lord of the Rings: Tales of Middle-earth #47)
Dunland Crebain (The Lord of the Rings: Tales of Middle-earth #82)
Easterling Vanguard (The Lord of the Rings: Tales of Middle-earth #83)
Grim Initiate (War of the Spark #130)
Herald of the Dreadhorde (War of the Spark #93)
Honor the God-Pharaoh (War of the Spark #132)
Invading Manticore (War of the Spark #134)
Lazotep Reaver (War of the Spark #96)
Mordor Muster (The Lord of the Rings: Tales of Middle-earth #96)
Orcish Medicine (The Lord of the Rings: Tales of Middle-earth #104)
Relentless Advance (War of the Spark #64)
Surrounded by Orcs (The Lord of the Rings: Tales of Middle-earth #73)
Swarming of Moria (The Lord of the Rings: Tales of Middle-earth #150)
The Torment of Gollum (The Lord of the Rings: Tales of Middle-earth #110)
Toll of the Invasion (War of the Spark #108)
Treason of Isengard (The Lord of the Rings: Tales of Middle-earth #74)
Warbeast of Gorgoroth (The Lord of the Rings: Tales of Middle-earth #152)

It is the moment of discovery, the triumph of the mind, and the end of these results.