Impervious Greatwurm 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
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays foror one mana of that creature's color.) Indestructible
Complete guide
Impervious Greatwurm is a massive threat that rewards you for building a wide board of creatures. Despite its high mana cost, its Convoke ability allows your existing army to bring this indestructible behemoth onto the battlefield much earlier than expected.
What It Does
Impervious Greatwurm is a 16/16 creature with Indestructible, meaning it cannot be destroyed by effects that say 'destroy' or by lethal combat damage. Its primary mechanic is Convoke, which allows you to tap untapped creatures you control to pay for its mana cost. Each creature you tap pays for {1} or one mana of that creature's color.
How It Resolves Step by Step
First, you announce you are casting Impervious Greatwurm and move it to the stack. Next, you calculate the total cost; since it costs {7}{G}{G}{G}, the total is 10 mana. During the step where you pay costs, you may tap any number of untapped creatures you control to reduce the amount of mana you need to pay from your lands. Once all mana is paid and creatures are tapped, the spell is officially cast. When it resolves, it enters the battlefield as a permanent that is very difficult for opponents to remove.
Common Mistakes
A common error is trying to use 'summoning sick' creatures for Convoke, but the rules specifically allow this; you can tap a creature you just played this turn to help cast the Wurm. However, you cannot tap the same creature for its own mana ability (like a mana elf) and for Convoke at the same time. If you tap it for mana, it is already tapped when you reach the point of paying for the spell via Convoke.
When to Play It
You should play Impervious Greatwurm when you have at least three green creatures or enough mana to cover the green requirements, as Convoke can only pay for the generic mana or the specific colors of the creatures tapped. It is best used as a finisher in decks that generate many tokens, turning small creatures into a singular, unstoppable force.
Interaction examples
Apex DevastatorIf you cast Apex Devastator, its Cascade triggers will look for spells with a mana value less than 10. Since Impervious Greatwurm has a mana value of 10, Cascade will skip over it. Even if you used Convoke to cast the Greatwurm for zero mana, its mana value remains 10.
Kozilek, Butcher of TruthWhen an opponent attacks you with Kozilek, Butcher of Truth, its Annihilator 4 ability triggers first, forcing you to sacrifice four permanents. If your Impervious Greatwurm survives the sacrifice, it can block Kozilek. Because the Greatwurm is Indestructible, it will take the 12 damage from Kozilek and survive, while also dealing 16 damage back to Kozilek, destroying the Eldrazi.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Impervious Greatwurm
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
You can tap any untapped creature you control to convoke a spell, even one you haven't controlled continuously since the beginning of your most recent turn.
No other card is named in this ruling.
- #2· Wizards of the Coast
Tapping an untapped creature that's attacking or blocking to convoke a spell won't cause that creature to stop attacking or blocking.
No other card is named in this ruling.
- #3· Wizards of the Coast
When calculating a spell's total cost, include any alternative costs, additional costs, or anything else that increases or reduces the cost to cast the spell. Convoke applies after the total cost is calculated. Convoke doesn't change a spell's mana cost or mana value.
No other card is named in this ruling.
- #4· Wizards of the Coast
If a creature you control has a mana ability with
in the cost, activating that ability while casting a spell with convoke will result in the creature being tapped before you pay the spell's costs. You won't be able to tap it again for convoke. Similarly, if you sacrifice a creature to activate a mana ability while casting a spell with convoke, that creature won't be on the battlefield when you pay the spell's costs, so you won't be able to tap it for convoke.No other card is named in this ruling.
- #5· Wizards of the Coast
Because convoke isn't an alternative cost, it can be used in conjunction with alternative costs.
No other card is named in this ruling.
- #6· Wizards of the Coast
Tapping a multicolored creature using convoke will pay for
or one mana of your choice of any of that creature's colors.No other card is named in this ruling.
Popular combos
Real combos played by the community, sorted by popularity.
Greater Good + Triskaidekaphile + Impervious Greatwurm
- 1Activate Greater Good by sacrificing Impervious Greatwurm, causing you to draw sixteen cards and discard three cards.
- 2At the beginning of your next upkeep, Triskaidekaphile triggers, causing you to win the game.
Legal formats
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Meta decks with Impervious Greatwurm
No archived Top 8 deck with this card yet.