Skittering Monstrosity 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
When you cast a creature spell, sacrifice this creature.
Complete guide
Skittering Monstrosity is a massive 5/5 Horror for just five mana, offering an aggressive stat line at a steep price. Its presence on the battlefield is fleeting, as it demands your total focus on its own carnage rather than summoning allies. Understanding its restrictive triggered ability is key to maximizing its power before it inevitably disappears.
A Fragile Titan
Skittering Monstrosity features a mandatory triggered ability that forces you to sacrifice it the moment you attempt to cast another creature spell. This is not an optional cost; as soon as a creature spell is cast from your hand, command zone, or any other zone, the trigger goes on the stack. Because it is a 5/5 for five mana, it is designed to end games quickly before you are forced to play more creatures.
Resolution and Timing
The sacrifice ability triggers when you 'cast' a creature spell, which means it happens long before that new creature actually enters the battlefield. The trigger is put onto the stack on top of the creature spell you just cast. This means Skittering Monstrosity will be sacrificed first, and only then will your new creature spell resolve. Even if your opponent counters the new creature spell, the sacrifice trigger has already occurred and will still result in the Monstrosity's death.
Common Pitfalls
A common mistake is thinking you can wait for the new creature to enter the battlefield before sacrificing the Monstrosity. Since the trigger is based on the act of casting, the Monstrosity is gone before you can benefit from any 'enters the battlefield' effects of the new creature that might require another creature to be present. Additionally, note that this ability only triggers on 'casting' spells; putting a creature onto the battlefield directly via an effect does not trigger the sacrifice.
Strategic Deployment
To get the most value out of Skittering Monstrosity, it should be the last creature you cast for several turns. It is best used in aggressive decks that can protect it with non-creature spells like instants or sorceries. Since it doesn't care about non-creature spells, you can still cast removal or combat tricks to clear a path for its 5 power to connect with the opponent.
Interaction examples
Solemn SimulacrumWith Skittering Monstrosity on the battlefield, you cast Solemn Simulacrum. The Monstrosity's ability triggers immediately and is placed on the stack above Solemn Simulacrum. The sacrifice trigger resolves, and Skittering Monstrosity is put into the graveyard. Finally, Solemn Simulacrum resolves and enters the battlefield, allowing you to search for a land.
Roaming ThroneIf you control Roaming Throne with 'Horror' chosen as the type, and you then cast another creature spell, Skittering Monstrosity's ability will trigger twice due to the Throne's effect. While you only have one Monstrosity to sacrifice, both triggers will go on the stack. The first one will cause you to sacrifice it, and the second one will simply do nothing as there is no longer a permanent to sacrifice.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Skittering Monstrosity
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
An ability that triggers when a player casts a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
No other card is named in this ruling.
Legal formats
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Meta decks with Skittering Monstrosity
No archived Top 8 deck with this card yet.