Terror of Mount Velus 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 Double strike (This creature deals both first-strike and regular combat damage.) When this creature enters, creatures you control gain double strike until end of turn.
Complete guide
Terror of Mount Velus is a high-impact Dragon that brings immediate aggression to your board. By granting your entire army double strike, it turns a simple combat phase into a potentially game-ending assault.
Double the Impact
When Terror of Mount Velus enters the battlefield, its triggered ability targets every creature you currently control. These creatures gain double strike until the end of the turn, meaning they will deal damage during both the first-strike and the regular combat damage steps. Note that the Dragon itself already has double strike, and having multiple instances of the keyword is redundant; it will not hit a third or fourth time.
Timing and Resolution
The ability checks which creatures you control at the exact moment it resolves. If you play a creature later in the turn after this ability has finished, that new creature will not have double strike. Furthermore, the bonus persists even if Terror of Mount Velus leaves the battlefield before combat begins, as the effect is tied to the creatures that were present when the trigger resolved.
Strategic Considerations
This card is best used as a finisher. Because it costs seven mana, you want to ensure you already have a established presence on the board to maximize the 'Enters' trigger. It is particularly effective with creatures that have 'whenever this creature deals combat damage' abilities, as double strike allows those abilities to trigger twice.
Interaction examples
If you control Ancient Copper Dragon and then play Terror of Mount Velus, the Ancient Copper Dragon gains double strike. When it attacks and is not blocked, it deals damage in the first-strike step, causing you to roll a d20 for Treasures. Then, it deals damage again in the regular combat step, allowing you to roll a second d20 and create even more Treasure tokens.
When Terror of Mount Velus enters, Etali, Primal Storm gains double strike. When Etali attacks, its 'whenever this creature attacks' ability triggers once (since double strike only affects damage, not the act of declaring an attack). However, once blockers are declared, Etali will deal its power in damage twice, making it much more likely to survive combat or destroy high-toughness blockers.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Terror of Mount Velus
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Multiple instances of double strike on the same creature are redundant.
No other card is named in this ruling.
- #2· Wizards of the Coast
The triggered ability affects only creatures you control at the time it resolves. Creatures you begin to control later in the turn won't gain double strike.
No other card is named in this ruling.
Legal formats
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Meta decks with Terror of Mount Velus
No archived Top 8 deck with this card yet.



Ancient Copper Dragon
Etali, Primal Storm