Knollspine Dragon is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Flying When this creature enters, you may discard your hand and draw cards equal to the damage dealt to target opponent this turn.
Complete guide
Knollspine Dragon is a powerful seven-mana flier that can completely refill your hand in a single turn. By capitalizing on the damage dealt to your foes, this Dragon turns aggression into pure card advantage.
Massive Card Draw Potential
When Knollspine Dragon enters the battlefield, you choose a target opponent. If that opponent was dealt damage earlier in the turn, you have the option to discard your current hand and draw a number of cards equal to that total damage. This ability counts all damage from any source, including combat damage, spells, or even damage dealt by other players.
How the Trigger Resolves
The ability triggers the moment the Dragon hits the battlefield, and you must choose a target opponent immediately. However, the decision to actually discard your hand and draw cards is made during the resolution of the ability. This is important because it allows you to see if the ability is countered or if the game state changes before you commit to losing your current hand.
Damage vs Life Loss
It is vital to distinguish between damage and life loss. Knollspine Dragon only counts damage. If an opponent paid life for a spell or lost life through an effect that isn't damage, those amounts are ignored. Conversely, if they were dealt 5 damage but also gained 10 life, the Dragon still sees that 5 damage was dealt and will let you draw five cards regardless of their current life total.
Timing Your Dragon
Because the ability checks for damage dealt 'this turn,' you typically want to cast Knollspine Dragon during your second main phase. This ensures you have already maximized the damage output from your combat phase or direct damage spells, allowing for the largest possible draw effect.
Interaction examples
Ancient Copper DragonDuring your combat phase, Ancient Copper Dragon attacks and deals 6 combat damage to an opponent. In your second main phase, you cast Knollspine Dragon. Upon entry, it targets that same opponent. When the ability resolves, you may discard your hand to draw six cards, perfectly supplementing the Treasures you created with Ancient Copper Dragon.
Etali, Primal StormYou attack with Etali, Primal Storm, and its trigger allows you to cast Knollspine Dragon for free from the top of your library. However, because Etali is still in the process of attacking and has not yet dealt combat damage, the Dragon's ability will likely draw zero cards unless you dealt damage earlier that turn via spells. To maximize the draw, you would need to cast the Dragon after Etali's combat damage has been dealt.
Imagine an opponent was hit by a 3-damage Lightning Bolt during their own turn, then you dealt 4 combat damage to them on your turn. When you play Knollspine Dragon, the ability checks the total damage dealt to that opponent 'this turn.' Since 'this turn' only refers to the current active turn, the Dragon only counts the 4 combat damage you dealt, ignoring the damage from the previous player's turn.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Knollspine Dragon
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
You target an opponent when the ability triggers. You don't decide whether you want to discard and draw until the ability resolves.
No other card is named in this ruling.
- #2· Wizards of the Coast
This ability counts the total amount of damage (both combat and noncombat) dealt to the targeted opponent by all sources (including ones you controlled and ones you didn't) over the course of the turn. Damage that was prevented or replaced doesn't count. Damage that resolved but didn't cause loss of life (due to Worship, for example) will count.
No other card is named in this ruling.
- #3· Wizards of the Coast
Knollspine Dragon's ability checks only whether damage was dealt. It doesn't care whether the player's life total also changed for other reasons (such as if the player paid life or gained life). For example, if an opponent was dealt 4 damage and gained 6 life during the turn, that player will have a higher life total than they started the turn with — but Knollspine Dragon's ability will let you discard your hand and draw four cards.
No other card is named in this ruling.
Legal formats
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Meta decks with Knollspine Dragon
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