Wurmcalling 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

Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.) Create an X/X green Wurm creature token.

Complete guide

Wurmcalling is a versatile green sorcery that allows you to summon increasingly large Wurm tokens throughout a game. Thanks to its Buyback ability, this card can serve as a repeatable win condition if you have the mana to support it. It scales perfectly from the early game to the late game, ensuring you never run out of threats.

Understanding Buyback

Buyback is an additional cost you may choose to pay as you cast the spell. When you cast Wurmcalling, you decide the value for X and then decide if you want to pay the extra {2}{G}. If you pay the Buyback cost, the spell returns to your hand instead of going to your graveyard upon resolution. This effectively lets you 'rent' the effect as long as you can afford the total mana cost.

How it Resolves Step-by-Step

First, you place Wurmcalling on the stack and announce the value of X and whether you are paying the Buyback cost. Next, you pay the total cost: {X}{G} plus the optional {2}{G}. When the spell resolves, a green Wurm creature token with power and toughness equal to X enters the battlefield. Finally, if the Buyback cost was paid, the card is placed directly into your hand; otherwise, it is put into your graveyard.

Common Pitfalls

One common mistake is forgetting that Wurmcalling must successfully resolve for Buyback to work. If the spell is countered by an opponent or fails to resolve for any reason, the Buyback effect does not apply and the card goes to the graveyard. Additionally, the X value refers only to the power and toughness of the token, not the Buyback cost itself, which is always a flat {2}{G}.

Strategic Timing

Because Wurmcalling is a sorcery, you can generally only cast it during your main phases. It is best used when you have excess mana or need a reliable way to use your resources every turn. By pairing it with ramp spells, you can create massive tokens while keeping the card available for future turns.

Interaction examples

Early Game Pressure

Farseek

On turn two, you cast Farseek to search for a Mountain and put it onto the battlefield. This extra mana allows you to cast Wurmcalling on turn three with X=2. Without Buyback, you get a 2/2 Wurm for {2}{G}, helping you establish an early board presence.

Developing Your Mana

Nature's Lore

You use Nature's Lore to put a Forest card onto the battlefield. With this increased mana pool, you can now afford to cast Wurmcalling for X=3 and pay the {2}{G} Buyback cost (total {5}{G}{G}). You create a 3/3 Wurm and return Wurmcalling to your hand to use again next turn.

Late Game Dominance

Farseek

Nature's Lore

After using Farseek and Nature's Lore earlier in the game to build a massive mana base of ten lands, you cast Wurmcalling for X=7 and pay the Buyback cost. You spend all ten mana to create a 7/7 Wurm, and the spell returns to your hand, allowing you to repeat this process every single turn until you overwhelm your opponent.

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