Keen Duelist 
Creature — Human Wizard
$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.
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Parker Luck96%
$0.31↓#8719↓0.331.0 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."
Duskmantle Seer90%
$0.24↓#13350↓0.2613.6 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."
Dark Tutelage86%
$0.23↓#5903↓0.07↓16.1 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."
Baneful Omen84%
$1.88↑#9957↓0.2416.4 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."
Caustic Bronco83%
$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."
Ruin Raider83%
$0.26↓#17857↓0.00↓8.9 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."
Darkstar Augur80%
$0.40↑#31470.202.1 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."
Pain Seer80%
$0.22↓#17331↓0.2012.6 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."
Sorin the Mirthless77%
$2.47↑#8061↓0.56↑4.8 years
"+1: Look at the top card of your library. You may reveal that card and put it into your hand. If you do, you lose life equal to its mana value."
Stronghold Arena76%
$0.17↓#17997↓0.00↓4.0 years↓
"Whenever one or more creatures you control deal combat damage to a player, you may reveal the top card of your library and put it into your hand. If you do, you lose life equal to its mana value."
Dark Confidant72%
$4.41↑#1238↑0.39↑20.9 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."
Twilight Prophet70%
$1.74↑#1122↑0.298.6 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."