21 cards where the cards are split and the mana value = 6

Armed // Dangerous (Dragon's Maze #122)
Consecrate // Consume (Ravnica Allegiance #224)
Coward // Killer (Doctor Who #77)
Depose // Deploy (Ravnica: Clue Edition #185)
Destined // Lead (Amonkhet #217)
Expansion // Explosion (Ravnica Remastered #243)
Farm // Market (Commander 2019 #192)
Give // Take (Dragon's Maze #129)
Grind // Dust (Hour of Devastation #155)
Insult // Injury (Amonkhet #213)
Leave // Chance (Hour of Devastation #153)
Onward // Victory (Amonkhet #218)
Prepare // Fight (Amonkhet #220)
Pure // Simple (Dissension #154)
Ready // Willing (Dragon's Maze #132)
Reason // Believe (Hour of Devastation #154)
Reduce // Rubble (Amonkhet #216)
Road // Ruin (Modern Horizons 2 #212)
Start // Finish (Amonkhet #215)
Thrash // Threat (Ravnica Remastered #246)
Toil // Trouble (Dragon's Maze #133)

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