Twins of Discord 
Creature — Eldrazi
$0.38 #6571 0.60 2.2 years
Whenever you attack, choose odd or even. Creatures with mana value of that quality can't block this turn. (Zero is even.)
Each other colorless creature you control has bloodthirst 2. (If an opponent was dealt damage this turn, that creature enters with two additional +1/+1 counters on it.)
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Cards similar to Twins of Discord 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.
Bloodlord of Vaasgoth73%
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"Bloodthirst 3"
Droning Bureaucrats70%
$0.15↓#27655↓0.27↓20.6 years↑
"
, 
: Each creature with mana value X can't attack or block this turn."
, : Each creature with mana value X can't attack or block this turn."
Void Winnower70%
$20.51↑#1697↑1.96↑10.9 years↑
"Your opponents can't block with creatures with even mana values."