Impervious Greatwurm 
Creature — Wurm
$3.97 #4416 0.35 7.9 years
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for 
or one mana of that creature's color.)
or one mana of that creature's color.)Indestructible
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Cards similar to Impervious Greatwurm expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Autochthon Wurm98%
$2.83↓#20167↓0.07↓20.9 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Arboretum Elemental96%
$0.10↓#22675↓0.22↓7.9 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Siege Wurm96%
$0.05↓#19274↓0.18↓20.9 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Feral Incarnation96%
$0.09↓#23446↓0.00↓12.1 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Scatter the Seeds96%
$0.14↓#8687↓0.22↓21.0 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Living Totem96%
$0.05↓#27026↓0.00↓12.1 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Root-Kin Ally95%
$0.03↓#30002↓0.00↓20.9 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Rosemane Centaur95%
$0.05↓#29529↓0.53↑7.9 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Overwhelm95%
$0.05↓#20463↓0.00↓21.0 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Worldsoul Colossus94%
$0.08↓#22681↓0.297.9 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Will-Forged Golem94%
$0.07↓#26050↓0.2712.1 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Halo Hopper94%
$0.25↓#17552↓0.00↓3.4 years↓
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Gather Courage93%
$0.06↓#20921↓0.00↓20.9 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Kavu Primarch92%
$0.06↓#23338↓0.4019.3 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Guardian of Vitu-Ghazi92%
$0.17↓#29720↓0.3820.9 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Sprout Swarm90%
$4.74↑#5607↓0.55↑19.3 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
March of the Multitudes90%
$0.60↓#3020↑0.19↓7.9 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Pack's Favor90%
$0.08↓#26539↓0.22↓7.9 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Ancient Imperiosaur90%
$0.36↓#8216↓0.22↓3.4 years↓
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Sundering Vitae90%
$0.11↓#17386↓0.00↓20.9 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."