| | Name | Type | Supertype | Cost | Rules | Health | # |
| Onyxia | Hero | | | Onyxia has +1 ATK while attacking.
10, Flip Onyxia  Destroy target opposing hero. | 20 | 1 |
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| Onyxia | Hero | | | Long-Range.
Onyxia has +2 ATK while attacking.
2, Flip Onyxia Put a Whelp into play for each resource you have. Use only on your turn. | 30 | 2 |
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| Onyxia | Hero | | | Onyxia has +3 ATK while attacking.
20, Flip Onyxia Destroy all opposing heroes. | 50 | 3 |
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| Another Lesson | Ability | | 3 | When Onyxia deals combat damage to an ally this turn, ready Onyxia. | | 4 |
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| Bellowing Roar | Ability | | 4 | Stage 3 Only.
Put all opposing allies into their owner's hands. Opponents can't play allies until after your next turn. | | 5 |
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| Brood of Onyxia | Ability | | 4 | Stage 2 Only.
Put ten Whelps into play. | | 6 |
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| Burninate | Ability | | 8 | Destroy all opposing abilities, allies, and equipment. | | 7 |
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| Crush | Ability | Instant | 1 | Destroy target ally. | | 8 |
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| Deep Breath | Ability | | 2+X | Stage 2 Only.
Onyxia deals X fire damage to each opposing hero and ally. Deep Breath can't be interrupted. | | 9 |
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| Devour | Ability | Instant | 1 | If Onyxia is defending, she deals 5 melee damage to target attacking hero or ally. | | 10 |
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| Draconic Might | Ability | Instant | 1 | Onyxia has +X ATK while attacking this turn, where X is the number of opposing heroes. | | 11 |
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| Draconic Rage | Ability | | 1 | Ongoing: Onyxia has +X ATK while attacking, where X is the current stage. | | 12 |
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| Dragon Hide | Ability | | 1 | Ongoing:  Prevent the next 2 damage that would be dealt to Onyxia this turn. | | 13 |
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| Engulfing Flames | Ability | | 3 | Attach to target opposing hero or ally, and Onyxia deals 5 damage to it.
Ongoing: At the start of your turn, Onyxia deals X fire damage to attached character, where X is the current stage. | | 14 |
|
| Flame Breath | Ability | | 2 | Onyxia deals X fire damage to each opposing hero and ally, where X is the current stage. | | 15 |
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| Foolish Mortals! | Ability | | 1 | Ongoing: Destroy Foolish Mortals! Prevent the next 5 damage that would be dealt to Onyxia this turn. | | 16 |
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| Head Slam | Ability | | 2 | As an additional cost to play Head Slam, put up to 5 damage on Onyxia. Onyxia deals that amount of melee damage to each opposing ally. | | 17 |
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| Home Lair Advantage | Ability | Instant | 1 | This turn, Onyxia can't be targeted by opponents, and your cards can't be interrupted. | | 18 |
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| How Fortuitous! | Ability | Instant | 2 | Draw a card for each opposing hero. | | 19 |
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| Knock Away | Ability | Instant | 1 | Prevent all damage that would be dealt to Onyxia this turn. | | 20 |
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| Lava Cracks | Ability | | 3 | Stage 3 Only.
Choose an opposing hero or ally and roll a die. Onyxia deals that amount of fire damage to it. Repeat this process for each other opposing character. | | 21 |
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| Learn Your Place, Mortal! | Ability | Instant | 3 | Draw cards until you reach your maximum hand size. | | 22 |
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| Meaningless Exertion | Ability | Instant | 1 | Choose one: Destroy target ability; or interrupt target ability card. | | 23 |
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| Roasted Flesh | Ability | Instant | 1 | Ongoing: Destroy Roasted Flesh Onyxia deals 3 fire damage to target opposing hero or ally. | | 24 |
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| Shattering Scales | Ability | | 4 | Destroy all opposing abilites and equipment. | | 25 |
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| Tail Swipe | Ability | | 2 | Destroy target ability, ally, or equipment. | | 26 |
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| Thrash | Ability | | 1 | Ongoing: Destroy Thrash Ready Onyxia. | | 27 |
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| Tooth and Claw | Ability | | 3 | Ongoing: Onyxia has +5 ATK while attacking. | | 28 |
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| Tossed into the Hatchery | Ability | | 2 | Put a whelp into play for each opposing ally. | | 29 |
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| Trample | Ability | | 2 | Ongoing: Onyxia has +2 ATK while attacking. When Onyxia attacks, you may exhaust target ally. | | 30 |
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| Whelp Pits, The | Ability | | 1 | Ongoing: At the start of your turn, if it's stage 2, roll a die and put that many Whelps into play.
Destroy The Whelp Pits Roll a die and put that many Whelps into play. | | 31 |
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| Wing Buffet | Ability | | 2 | Exhaust all opposing allies. They can't ready during their controllers' next ready step. | | 32 |
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| Wrath of Onyxia | Ability | | 6 | Destroy all opposing allies. | | 33 |