Tattermunge Duo 
Creature — Goblin Warrior Shaman
$0.11 #29895 0.00 18.3 years
Whenever you cast a red spell, this creature gets +1/+1 until end of turn.
Whenever you cast a green spell, this creature gains forestwalk until end of turn. (It can't be blocked as long as defending player controls a Forest.)
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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.
Orbweaver Kumo77%
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"This creature gets +1/+1 as long as you control another red creature."
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"Whenever you cast a red spell, create a 2/2 red Soldier creature token."
Emberstrike Duo74%
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"Whenever you cast a red spell, this creature gains first strike until end of turn."
+1 more matching line
Veldrane of Sengir74%
$0.60↑#305400.0030.9 years↑
"
: Veldrane gets -3/-0 and gains forestwalk until end of turn."
: Veldrane gets -3/-0 and gains forestwalk until end of turn."
Heartlash Cinder72%
$0.15↑#263400.0018.1 years
"When this creature enters, it gets +X/+0 until end of turn, where X is the number of red mana symbols in the mana costs of permanents you control."
Foundry Street Denizen72%
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"Whenever another red creature you control enters, this creature gets +1/+0 until end of turn."
Runaway Steam-Kin71%
$1.40↑#1661↑0.39↑7.9 years↓
"Whenever you cast a red spell, if this creature has fewer than three +1/+1 counters on it, put a +1/+1 counter on this creature."
Ember Weaver70%
$0.04↓#275720.0417.6 years
"As long as you control a red permanent, this creature gets +1/+0 and has first strike."
Cinder Pyromancer70%
$0.30↑#12232↑0.0618.1 years
"Whenever you cast a red spell, you may untap this creature."