Engineered Plague 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

As this enchantment enters, choose a creature type. All creatures of the chosen type get -1/-1.

Complete guide

Engineered Plague is a classic Black enchantment designed to devastate specific creature strategies by thinning their ranks. By targeting a single creature type, it creates a persistent field effect that can wipe out small tokens or weaken larger threats permanently.

Choosing the Target

As Engineered Plague enters the battlefield, you must choose a creature type like Goblin, Elf, or Human. This choice is made as the spell resolves; it does not target, and players cannot respond after you have made your choice. The reduction is a continuous effect that applies to all creatures of that type currently on the battlefield and any that enter later.

Step-by-Step Resolution

First, you cast Engineered Plague and it goes on the stack. Once it resolves, you choose a creature type as it enters the battlefield. Immediately, all creatures of that type receive -1/-1. If a creature's toughness becomes 0 or less due to this effect, it is put into its owner's graveyard the next time state-based actions are checked, which happens before any player can cast spells or activate abilities.

Common Mistakes

A common misconception is that this effect targets specific creatures; it does not, meaning it bypasses Hexproof and Shroud. Additionally, remember that if a creature has multiple types, such as a Changeling, it will be affected as long as the chosen type is one of its many types. If you choose 'Shapeshifter' and a creature is both a Goblin and a Shapeshifter, it still receives the -1/-1.

Strategic Timing

Play Engineered Plague when you are facing decks that rely on small, synergistic creatures of the same type. It is particularly effective against token generators, as many tokens are 1/1 creatures that will die instantly upon entering the battlefield while this enchantment is active.

Interaction examples

Dealing with Changelings

Black Market Connections

If you choose 'Shapeshifter' as Engineered Plague enters, the 3/2 Shapeshifter token created by Black Market Connections will enter the battlefield and immediately become a 2/1. Because it has changeling, it is every creature type, so it will be affected regardless of which specific creature type you chose.

Stacking the Plague

If you control two copies of Engineered Plague and both have 'Elf' chosen, all Elves get -2/-2. This allows you to scale the effect to kill larger creatures that would otherwise survive a single instance of the enchantment.

Passive Resource Management

Phyrexian Arena

While Engineered Plague controls the board by suppressing the opponent's creatures, cards like Phyrexian Arena allow you to maintain card advantage. The Plague acts as a static defense, ensuring that the life lost from the Arena is not compounded by attacks from small utility creatures.

Guide written with AI from the official text and rulings. Official English text prevails.