Caustic Bronco 

Creature — Snake Horse Mount
$0.36 #6560 0.04 2.4 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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Duskmantle Seer89%
$0.24↓#13350↓0.26↑13.6 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."
Pain Seer88%
$0.22↓#17331↓0.20↑12.6 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."
Ruin Raider85%
$0.26↓#17857↓0.008.9 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."
Dark Tutelage84%
$0.23↓#59030.0716.1 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."
Keen Duelist83%
$0.34↓#3188↑0.24↑5.4 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."
Parker Luck83%
$0.31↓#8719↓0.33↑1.0 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."