Crystalline EntityHow it works & interactions with other cards

What it Does

Crystalline Entity is an 8-mana artifact creature with Flying and a powerful enter-the-battlefield trigger. When it enters the battlefield, if it was cast, it destroys all creatures that do not have the 'Artifact' type. This is a conditional trigger; it checks how the creature arrived on the battlefield to ensure its destructive ability only fires when played fairly from your hand or another zone where it was cast.

Resolving the Trigger Step by Step

First, you must cast Crystalline Entity and have it successfully resolve. Once it enters the battlefield, the game checks if it was cast. If it was, the triggered ability is placed on the stack. When the ability resolves, every creature on the battlefield is examined. If a creature does not have the 'Artifact' card type, it is destroyed. Notably, this does not target, so creatures with Hexproof or Shroud are still destroyed, though creatures with Indestructible will survive.

Common Mistakes

The most frequent error with Crystalline Entity involves 'blink' or 'reanimate' effects. If you put Crystalline Entity onto the battlefield using an effect like Reanimate or a blink effect like Flickerwisp, its ability will not trigger because the creature was not 'cast.' Additionally, remember that this card destroys all nonartifact creatures, including your own, so plan your board state accordingly.

When to Play It

This card is best used in artifact-heavy decks where your own board is largely immune to its effect. It acts as a one-sided board wipe in those scenarios, leaving you with your army intact while your opponents lose their utility creatures and attackers. Since it has Flying, it also serves as a reliable finisher once the ground is clear.

Interaction examples

The Machine Army's Protection

Myr Battlesphere

If you control Myr Battlesphere and its four Myr tokens, and then cast Crystalline Entity, your board remains untouched. Because Myr Battlesphere and the tokens are artifact creatures, the Entity's ability ignores them entirely while destroying your opponent's nonartifact creatures.

Precision Destruction

Meteor Golem

You cast Crystalline Entity to wipe the board of all standard creatures. Your Meteor Golem survives because it is an artifact creature. Following the wipe, you can use other artifact creatures like Meteor Golem to pick off any surviving non-creature permanents or Indestructible threats that Crystalline Entity couldn't handle alone.