Robber Fly 
Creature — Insect
$0.30 #27948 0.25 26.9 years
Flying
Whenever this creature becomes blocked, defending player discards all the cards in their hand, then draws that many cards.
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Cards similar to Robber Fly 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.
Slate Street Ruffian88%
$0.07↓#261610.10↓13.6 years↓
"Whenever this creature becomes blocked, defending player discards a card."
Alley Grifters88%
$0.12↓#262520.09↓26.9 years
"Whenever this creature becomes blocked, defending player discards a card."
Barbed Shocker86%
$0.22↓#19049↑0.2519.9 years↓
"Whenever this creature deals damage to a player, that player discards all the cards in their hand, then draws that many cards."
Shocker86%
$1.02↑#230030.2028.9 years↑
"Whenever this creature deals damage to a player, that player discards all the cards in their hand, then draws that many cards."
Catacomb Dragon84%
$3.56↑#264340.3129.9 years↑
"Flying"
Screeching Buzzard82%
$0.04↓#270620.42↑23.9 years↓
"Flying"
Whirlpool Drake81%
$0.13↓#16704↑0.42↑25.3 years↓
"Flying"
Stoic Ephemera80%
$0.12↓#278060.2220.3 years↓
"Flying"
Laquatus's Creativity79%
$0.32↑#21723↑0.50↑24.9 years↓
"Target player draws cards equal to the number of cards in their hand, then discards that many cards."
Sphinx of Enlightenment77%
$0.20↓#9448↑0.60↑6.8 years↓
"Flying"
Wheel and Deal76%
$17.24↑#5859↑0.44↑23.9 years↓
"Any number of target opponents each discard their hands, then draw seven cards."
Corrupt Official76%
$0.38↑#300530.00↓26.9 years
"Whenever this creature becomes blocked, defending player discards a card at random."
Collective Defiance76%
$0.17↓#7614↑0.13↓10.1 years↓
"• Target player discards all the cards in their hand, then draws that many cards."
Chambered Nautilus74%
$0.17↓#272550.07↓26.9 years
"Whenever this creature becomes blocked, you may draw a card."
Drelnoch73%
$0.10↓#277660.00↓20.1 years↓
"Whenever this creature becomes blocked, you may draw two cards."
Sycorax Commander72%
$0.30#10414↑0.79↑2.9 years↓
"When this creature enters, each opponent faces a villainous choice — That opponent discards all the cards in their hand, then draws that many cards minus one, or this creature deals damage to that player equal to the number of cards in their hand."
Freewind Equenaut72%
$0.11↓#282020.2221.0 years↓
"Flying"
Dragon Mage72%
$0.18↓#2926↑0.49↑23.3 years↓
"Whenever this creature deals combat damage to a player, each player discards their hand, then draws seven cards."
Guardian of the Gateless72%
$0.30#13035↑0.10↓13.6 years↓
"Flying"
Saprazzan Heir71%
$1.98↑#21450↑0.00↓26.9 years
"Whenever this creature becomes blocked, you may draw three cards."