Unstable Experiment 
Instant
$0.18 #8143 0.20 1.0 years
Target player draws a card, then up to one target creature you control connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on that creature.)
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Mob Lookout80%
$0.16↓#15349↓0.261.0 years
"When this creature enters, target creature you control connives."
Combat Tutorial79%
$0.19↑#5364↑0.04↓1.2 years
"Target player draws two cards. Put a +1/+1 counter on up to one target creature you control."
Catalog79%
$0.07↓#16812↓0.00↓27.9 years↑
"Draw two cards, then discard a card."
Obscura Confluence78%
$0.28↑#17425↓0.31↑4.4 years↑
"• Target creature connives."
Trickster's Stratagem77%
$0.09↓#22114↓0.00↓0.2 years
"The owner of target creature an opponent controls puts it into their library second from the top or on the bottom. Then up to one target creature you control connives."
Whirlwind Technique76%
$0.18#12171↓0.00↓0.8 years
"Target player draws two cards, then discards a card."
Snow Day75%
$0.13↓#24332↓0.125.4 years↑
"Draw two cards, then discard a card."
Raffine's Informant74%
$0.22↑#20795↓0.00↓4.4 years↑
"When this creature enters, it connives."
Psionic Snoop74%
$0.14↓#25755↓0.53↑4.4 years↑
"When this creature enters, it connives."
Red Room Recruit74%
$0.21↑#20241↓0.00↓0.2 years
"When this creature enters, it connives."
Depth Defiler74%
$0.16↓#18945↓0.172.2 years↑
"• Target player draws two cards, then discards a card."
Echo Inspector74%
$0.08↓#23729↓0.154.4 years↑
"When this creature enters, it connives."
Revel Ruiner74%
$0.04↓#24823↓0.124.4 years↑
"When this creature enters, it connives."
Rousing Read72%
$0.21↑#19362↓0.00↓6.2 years↑
"When this Aura enters, draw two cards, then discard a card."
Leader, Super-Genius71%
$0.39↑#93790.00↓0.2 years
"If a creature you control would connive, instead you draw a card, then that creature connives."
Wistful Thinking71%
$0.10↓#24587↓0.1319.6 years↑
"Target player draws two cards, then discards four cards."
Huddle Up71%
$0.11↓#22791↓0.40↑8.2 years↑
"Two target players each draw a card."
Calamitous Tide70%
$0.13↓#15570↓0.242.1 years↑
"Return up to two target creatures to their owners' hands. Draw two cards, then discard a card."
Cost of Brilliance70%
$0.17↓#13154↓0.00↓0.4 years
"Target player draws two cards and loses 2 life. Put a +1/+1 counter on up to one target creature."
Confusticate and Bebother70%
$0.15↓#15653↓0.00↓0.1 years
"• Draw two cards, then discard a card."