Callidus Assassin 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
Flash Polymorphine — You may have this creature enter tapped as a copy of any creature on the battlefield, except it has "When this creature enters, destroy up to one other target creature with the same name as this creature."
Complete guide
Callidus Assassin is a versatile shapeshifter that combines the stealth of Flash with the lethality of an expert executioner. It doesn't just mimic its prey; it enters the battlefield specifically to eliminate the original creature it copied. This unique ability makes it a powerful tool for turning an opponent's greatest threat against them while simultaneously removing it.
The Polymorphine Ability
As Callidus Assassin enters the battlefield, you may choose any creature already on the battlefield to copy. If you do, Callidus Assassin enters tapped and takes on all the printed characteristics of that creature, such as name, mana cost, types, and abilities. Crucially, it also gains a unique triggered ability: 'When this creature enters, destroy up to one other target creature with the same name as this creature.' If you choose not to copy anything, it remains a standard 3/3 Human Shapeshifter Assassin without the destruction trigger.
Step-by-Step Resolution
First, as the spell resolves, you make the choice to copy a creature; this does not use the stack and cannot be responded to once resolution begins. Second, Callidus Assassin enters the battlefield as that creature (tapped) and any 'Enters the Battlefield' (ETB) triggers—both from the copied creature and its own destruction ability—are put onto the stack. Third, you choose the targets for these triggers and the order in which they resolve. Finally, the targets are destroyed and the copied effects occur.
Common Pitfalls
A common mistake is forgetting that Callidus Assassin must enter tapped if it becomes a copy. Additionally, keep in mind that it only copies the 'base' card. It does not copy counters, Auras, Equipment, or temporary power/toughness buffs affecting the original. If you copy a token, Callidus Assassin becomes a nontoken permanent with the attributes defined by the effect that created that token. Also, it cannot copy a creature that is entering the battlefield at the exact same time as itself.
When to Strike
Because this card has Flash, the best time to play it is during an opponent's turn to disrupt their strategy. You can wait for them to commit a high-value creature to the board or move to combat, then flash in the Assassin to kill their threat and leave yourself with a copy of that same powerful creature ready to untap on your next turn.
Interaction examples
Gray Merchant of AsphodelIf you cast Callidus Assassin and choose to copy an opponent's Gray Merchant of Asphodel, two triggers occur when it enters: the Merchant's life-drain ability and the Assassin's destruction ability. You can target the opponent's original Gray Merchant of Asphodel with the destruction trigger. Because your new Assassin has {B}{B} in its mana cost, it will even contribute to your own devotion to black as the life-drain trigger resolves.
Syr Konrad, the GrimWhen you use Callidus Assassin to copy Syr Konrad, the Grim, you target the original Syr Konrad with the destruction ability. Since your Assassin is now a copy of Syr Konrad, its 'Whenever another creature dies' ability will see the original Syr Konrad being put into the graveyard. This results in the original dying and your new copy dealing 1 damage to each opponent immediately.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Callidus Assassin
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Callidus Assassin copies exactly what was printed on the original creature (unless that creature is copying something else or is a token; see below) and it has the triggered ability. It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or any Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, or so on.
No other card is named in this ruling.
- #2· Wizards of the Coast
The triggered ability that Callidus Assassin has is part of its copy effect and is a copiable value that other effects may copy.
No other card is named in this ruling.
- #3· Wizards of the Coast
If the chosen creature is copying something else (for example, if the chosen creature is another Callidus Assassin), then your Callidus Assassin enters the battlefield as whatever the chosen creature copied.
No other card is named in this ruling.
- #4· Wizards of the Coast
If the chosen creature is a token, Callidus Assassin copies the original characteristics of that token as stated by the effect that created the token. Callidus Assassin is not a token in this case.
No other card is named in this ruling.
- #5· Wizards of the Coast
Any enters-the-battlefield abilities of the copied creature will trigger when Callidus Assassin enters the battlefield. You get to choose the order of those abilities and the triggered ability it has due to its copy effect. Any "as [this creature] enters the battlefield" or "[this creature] enters the battlefield with" abilities of the chosen creature will also work.
No other card is named in this ruling.
- #6· Wizards of the Coast
If Callidus Assassin somehow enters the battlefield at the same time as another creature, Callidus Assassin can't become a copy of that creature. You may choose only a creature that's already on the battlefield.
No other card is named in this ruling.
- #7· Wizards of the Coast
You can choose not to copy anything. In that case, Callidus Assassin enters the battlefield as a 3/3 creature. Notably, it does not have "When this creature enters the battlefield, destroy up to one other target creature with the same name as this creature."
No other card is named in this ruling.
Legal formats
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Meta decks with Callidus Assassin
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