A player's maximum library size determines the total number of cards a player may possess between their dueling deck and sideboard. The maximum library size increases with each level a character gains.
This table shows the maximum library size at each character level.
| Level | Maximum Library Size |
|---|---|
| 1 | 38 |
| 2 | 40 |
| 3 | 42 |
| 4 | 44 |
| 5 | 46 |
| 6 | 48 |
| 7 | 50 |
| 8 | 52 |
| 9 | 54 |
| 10 | 56 |
| 11 | 58 |
| 12 | 60 |
| 13 | 62 |
| 14 | 64 |
| 15 | 66 |
| 16 | 68 |
| 17 | 70 |
| 18 | 72 |
| 19 | 74 |
| 20 | 76 |