Sprout Swarm 
Instant
$3.73 #5539 0.25 19.5 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.)Buyback 
(You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)
(You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)Create a 1/1 green Saproling creature token.
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Cards similar to Sprout Swarm 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.
Kavu Primarch98%
$0.07↓#23762↓0.00↓19.5 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↓#19611↓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."
Living Totem94%
$0.05↓#27389↓0.06↓12.3 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."
Arboretum Elemental94%
$0.11↓#22953↓0.00↓8.0 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."
Rosemane Centaur92%
$0.03↓#29785↓0.258.0 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."
Overwhelm92%
$0.04↓#20682↓0.06↓21.2 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 Ally92%
$0.04↓#30373↓0.07↓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 Colossus91%
$0.09↓#22998↓0.11↓8.0 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."
Scatter the Seeds90%
$0.13↓#8780↓0.00↓21.2 years↑
"Create three 1/1 green Saproling creature tokens."
+1 more matching line
Gather Courage90%
$0.10↓#21348↓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."
Halo Hopper90%
$0.23↓#18087↓0.00↓3.5 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 Golem90%
$0.05↓#26313↓0.00↓12.3 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-Ghazi90%
$0.16↓#30087↓0.07↓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."
Lab Rats89%
$0.35↓#12853↓0.2828.6 years↑
"Create a 1/1 black Rat creature token."
+1 more matching line
Recruit the Worthy89%
$0.20↓#17382↓0.06↓7.4 years↓
"Create a 1/1 white Soldier creature token."
+1 more matching line
Feral Incarnation89%
$0.08↓#23698↓0.00↓12.3 years↓
"Create three 3/3 green Beast creature tokens."
+1 more matching line
Impervious Greatwurm88%
$4.08↑#45240.07↓8.0 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."
March of the Multitudes88%
$0.64↓#3035↑0.13↓8.0 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."
Pack's Favor88%
$0.10↓#26881↓0.00↓8.0 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."
Ancient Imperiosaur88%
$0.37↓#8386↓0.253.5 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."