Mask of the Schemer 
Artifact — Equipment
$2.51 #11531 0.07 4.5 years
Whenever equipped creature deals combat damage to a player, it connives X, where X is the amount of damage it dealt to that player. (Draw X cards, then discard X cards. Put a +1/+1 counter on that creature for each nonland card discarded this way.)
Equip
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Security Bypass86%
$0.29↓#6098↑0.154.5 years
"Enchanted creature has "Whenever this creature deals combat damage to a player, it connives.""
Pip-Boy 300084%
$5.77↑#2708↑0.25↑2.6 years↓
"Equip "
"
Zephyr Boots82%
$0.36↓#4552↑0.035.5 years↑
"Whenever equipped creature deals combat damage to a player, draw a card, then discard a card."
+1 more matching line
Swordsman, Sharp Scoundrel78%
$0.11↓#20117↓0.110.3 years↓
"Whenever an equipped creature you control attacks, it connives."
Atlantean Skirmisher78%
$0.26↓#24329↓0.120.3 years↓
"Whenever this creature attacks, it connives."
Doc Ock's Henchmen78%
$0.16↓#134960.56↑1.1 years↓
"Whenever this creature attacks, it connives."
Namor, Scourge of the Seas77%
$0.89↓#17874↓0.39↑0.3 years↓
"At the beginning of combat on your turn, target creature you control connives."
Skeleton Key76%
$0.27↓#8585↑0.1410.5 years↑
"Whenever equipped creature deals combat damage to a player, you may draw a card. If you do, discard a card."
+1 more matching line
Locke Cole76%
$0.22↓#110220.091.4 years↓
"Whenever this card deals combat damage to a player, draw a card, then discard a card."
Norman Osborn // Green Goblin76%
$15.60↑#4715↑0.69↑1.1 years↓
"Whenever this card deals combat damage to a player, he connives."
Baron Strucker, HYDRA Overlord76%
$0.20↓#7808↑0.21↑0.3 years↓
"Whenever another Villain you control enters, you may have it connive. Do this only once each turn."
Scurrilous Sentry76%
$0.11↓#16418↓0.002.3 years↓
"Whenever this creature enters or attacks, it connives."
Prowler, Clawed Thief75%
$0.21↓#7387↑0.82↑1.1 years↓
"Whenever another Villain you control enters, this card connives."
Illuminator Virtuoso75%
$0.21↓#16668↓0.064.5 years
"Whenever this creature becomes the target of a spell you control, it connives."
Hypnotic Grifter75%
$0.23↓#22594↓0.124.5 years
"
: This creature connives."
: This creature connives."
Leader, Super-Genius74%
$0.34↓#8287↑0.130.3 years↓
"At the beginning of combat on your turn, target creature you control connives."
Raffine, Scheming Seer74%
$3.91↑#4474↑0.37↑4.5 years
"Whenever you attack, target attacking creature connives X, where X is the number of attacking creatures."
Scorpion, Seething Striker74%
$0.19↓#112590.33↑1.1 years↓
"At the beginning of your end step, if a creature died this turn, target creature you control connives."
Mask of Memory74%
$0.33↓#980↑0.1423.0 years↑
"Whenever equipped creature deals combat damage to a player, you may draw two cards. If you do, discard a card."
+1 more matching line
Mob Lookout74%
$0.09↓#15371↓0.001.1 years↓
"When this creature enters, target creature you control connives."