Caustic Bronco 
Creature — Snake Horse Mount
$0.34 #6652 0.19 2.5 years
Whenever this creature attacks, reveal the top card of your library and put it into your hand. You lose life equal to that card's mana value if this creature isn't saddled. Otherwise, each opponent loses that much life.
Saddle 3 (Tap any number of other creatures you control with total power 3 or more: This Mount becomes saddled until end of turn. Saddle only as a sorcery.)
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Cards similar to Caustic Bronco expected a card that isn't here?
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Keen Duelist88%
$0.32↓#3193↑0.155.5 years↑
"At the beginning of your upkeep, you and target opponent each reveal the top card of your library. You each lose life equal to the mana value of the card revealed by the other player. You each put the card you revealed into your hand."
Duskmantle Seer88%
$0.26↓#13653↓0.2313.7 years↑
"At the beginning of your upkeep, each player reveals the top card of their library, loses life equal to that card's mana value, then puts it into their hand."
Parker Luck86%
$0.26↓#8500↓0.05↓1.1 years↓
"At the beginning of your end step, two target players each reveal the top card of their library. They each lose life equal to the mana value of the card revealed by the other player. Then they each put the card they revealed into their hand."
Baneful Omen86%
$1.96↑#10234↓0.47↑16.5 years↑
"At the beginning of your end step, you may reveal the top card of your library. If you do, each opponent loses life equal to that card's mana value."
Pain Seer85%
$0.24↓#17713↓0.00↓12.7 years↑
"Whenever this creature becomes untapped, reveal the top card of your library and put that card into your hand. You lose life equal to that card's mana value."
Venomsac Lagac84%
$0.17↓#19281↓0.00↓1.7 years
"Saddle 2"
Alacrian Jaguar84%
$0.17↓#22199↓0.291.7 years
"Saddle 1"
Giant Beaver83%
$0.13↓#19237↓0.252.5 years
"Saddle 3"
Ruin Raider83%
$0.41↑#18202↓0.129.1 years↑
"At the beginning of your end step, if you attacked this turn, reveal the top card of your library and put that card into your hand. You lose life equal to the card's mana value."
Brightfield Glider82%
$0.11↓#20077↓0.00↓1.7 years
"Saddle 3"
Dark Tutelage82%
$0.20↓#59950.2516.3 years↑
"At the beginning of your upkeep, reveal the top card of your library and put that card into your hand. You lose life equal to its mana value."
Bridled Bighorn82%
$0.15↓#18641↓0.00↓2.5 years
"Saddle 2"
Quilled Charger80%
$0.04↓#26194↓0.07↓2.5 years
"Saddle 2"
Gilded Ghoda80%
$0.19↓#13190↓0.00↓1.7 years
"Saddle 1"
Twilight Prophet80%
$2.00↑#1144↑0.31↑8.8 years↑
"At the beginning of your upkeep, if you have the city's blessing, reveal the top card of your library and put it into your hand. Each opponent loses X life and you gain X life, where X is that card's mana value."
Dracosaur Auxiliary79%
$0.22↓#19990↓0.221.7 years
"Saddle 3"
Congregation Gryff79%
$0.25↓#17389↓0.00↓2.5 years
"Saddle 3"
Stubborn Burrowfiend78%
$0.16↓#20640↓0.00↓2.5 years
"Saddle 2"
Drover Grizzly78%
$0.16↓#10446↓0.00↓2.5 years
"Saddle 1"
Archmage's Newt78%
$0.19↓#13664↓0.00↓2.5 years
"Saddle 3"