| Name | Cost | Price |
|---|---|---|
| Momo, Friendly Flier | — | |
| Momo, Rambunctious Rascal | $0.19 | |
| Mona Lisa, Ever Adaptable | $5.29 | |
| Monastery Loremaster | $0.05 | |
| Monastery Mentor | $0.60 | |
| Monastery Messenger | $0.09 | |
| Monastery Raid | $0.22 | |
| Monastery Siege | $0.64 | |
| Monastery Swiftspear | $0.37 | |
| Mondo Gecko | $1.90 | |
| Mondrak, Glory Dominus | $43.46 | |
| Mongrel Pack | $0.88 | |
| Monica Rambeau // Photon, Living Light | $1.37 | |
| Moniker Mage | $0.12 | |
| Monitor Monitor | — | |
| Monk Class | — | |
| Monkey- | $0.14 | |
| Monkey Cage | $3.53 | |
| Monkey Monkey Monkey | $0.19 | |
| Monk Gyatso | $6.72 | |
| Monk Idealist | $0.15 | |
| Monologue Tax | $2.39 | |
| Monoskelion | $0.17 | |
| Monoxa, Midway Manager | — |