As I've been leveling up my accounts, I've found I really wanted this chart, so I thought I would make one for you. As monsters level us, they gain abilities, and some of these are extremely important - attack for Swamp Thing and Goblin Shaman, Heal for Flesh Golem, Blast for Fire Demon, and so on. Knowing where those abilities come in is very important for deciding how to level up your teams. Since leveling up always begins with your summoner, I've decided to group new abilities by rare summoner level. To keep this from being huge, I'll split it into separate posts by splinter.

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Summoner Level 1: Inherent Abilities
| Card | Ability |
| Goblin Shaman | Weaken |
| Giant Roc | Flying |
| Kobold Miner | Sneak |
| Fire Beetle | Snipe |
| Serpentine Soldier | Shield |
| Pit Ogre | Stun |
| Cerberus | Heal |
| Flame Imp | Flying |
| Serpent of the Flame | Retaliate |
| Elemental Phoenix | Flying |
Summoner Level 2: Level 3 Commons, Level 2 Rares and Epics
| Card | Level | Ability |
| Goblin Shaman | 3 | Magic Attack |
| Serpent of the Flame | 2 | Armor |
Summoner Level 3: Level 4 Commons, Level 3 Rares, Level 2 Legendaries
| Card | Level | Ability |
| Elemental Phoenix | 2 | Blast |
Summoner Level 4: Level 5 Commons, Level 4 Rares, Level 3 Epics
| Card | Level | Ability |
| Goblin Shaman | 5 | Slow |
| Fire Beetle | 5 | Armor |
| Serpentine Soldier | 4 | Dodge |
| Pit Ogre | 4 | Enrage |
| Fire Demon | 3 | Blast |
| Serpent of the Flame | 3 | Poison |
Summoner Level 5: Level 6 Commons, Level 5 Rares, Level 4 Epics, Level 3 Legendaries
| Card | Level | Ability |
| Giant Roc | 6 | Trample |
| Cerberus | 5 | Retaliate |
| Flame Imp | 5 | Swiftness |
| Elemental Phoenix | 3 | Magic Reflect |
Summoner Level 6: Level 8 Commons, Level 6 Rares, Level 5 Epics
| Card | Level | Ability |
| Serpent of the Flame | 5 | Piercing |
Summoner Level 7: Level 9 Commons, Level 7 Rares, Level 4 Legendaries
| Card | Level | Ability |
| Serpentine Soldier | 7 | Thorns |
| Pit Ogre | 7 | Void |
| Elemental Phoenix | 4 | Dodge |
Summoner Level 8: Level 10 Commons, Level 8 Rares, Level 6 Epics
No new abilites.
As you can see, returns are substantially focused on Summoner Level 4 and Level 5. Goblin Shaman's attack at level 2 is extremely important in team building, as is Phoenix' Blast at level 3, but they're dwarfed by the slew of essential new abilities unlocked at summoner level 4. Of the later abilities, the most important are Flame Imp's Swiftness, Serpentine Soldier's Thorns, and the two added by Phoenix.