Coiling WoodwormHow it works & interactions with other cards

Natural Scaling

Coiling Woodworm features a characteristic-defining ability that sets its power based on the total number of Forests currently on the battlefield. This is not a one-time check when the creature enters; it is a continuous effect that applies in all zones, including the graveyard and exile. Importantly, this ability counts all Forests, not just the ones you control, making it particularly potent in multiplayer games or against other green-based strategies.

Step-by-Step Resolution

When Coiling Woodworm is on the battlefield, the game constantly checks the number of permanents with the Forest subtype. If a player plays a Forest, the Woodworm's power increases immediately without using the stack. Conversely, if a Forest is destroyed or returned to a player's hand, the Woodworm's power decreases instantly. Because this is a continuous effect, it does not trigger any abilities that look for 'whenever a creature's power changes'.

Common Pitfalls

A common mistake is forgetting that Coiling Woodworm counts only lands with the 'Forest' subtype, not every basic land or every green-producing land. While a basic Forest counts, a non-basic land like a utility land that produces green mana but lacks the Forest type will not contribute to the Woodworm's power. Additionally, remember that its toughness is a static 1, so while it can become an offensive powerhouse, it remains very fragile to direct damage or -1/-1 effects.

Strategic Timing

To get the most out of Coiling Woodworm, you should aim to play it when you have established a solid mana base or have ways to rapidly put more lands into play. Since its power updates dynamically, you can use ramp spells or abilities to 'buff' your Woodworm during the combat phase, potentially surprising an opponent who didn't account for the sudden increase in damage.

Interaction examples

Expanding the Canopy

Solemn Simulacrum

If you control Coiling Woodworm and three Forests, its power is currently 3. When you cast Solemn Simulacrum and use its enter-the-battlefield ability to find a basic Forest and put it onto the battlefield, the number of Forests increases to four. The Coiling Woodworm immediately becomes a 4/1 creature as soon as the land enters.

Sacrifice for Strength

Sakura-Tribe Elder

During your opponent's turn, if they declare an attacker, you can block with Sakura-Tribe Elder and then sacrifice it to activate its ability. By searching for a basic Forest and putting it onto the battlefield, you permanently increase the power of your Coiling Woodworm, preparing it for a much stronger counter-attack on your next turn.

Global Forest Count

If you have two Forests and your opponent has three Forests, Coiling Woodworm will be a 5/1 creature. Because the card text specifies 'Forests on the battlefield' rather than 'Forests you control', it rewards you for your opponent's land choices as well.