Yahenni's Expertise 
Sorcery
$0.42 #8612 0.44 9.6 years
All creatures get -3/-3 until end of turn.
You may cast a spell with mana value 3 or less from your hand without paying its mana cost.
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Sram's Expertise97%
$0.77↑#69070.19↓9.6 years
"You may cast a spell with mana value 3 or less from your hand without paying its mana cost."
Baral's Expertise94%
$0.24↓#3807↑0.479.6 years
"You may cast a spell with mana value 4 or less from your hand without paying its mana cost."
Rishkar's Expertise94%
$3.59↑#243↑0.429.6 years
"You may cast a spell with mana value 5 or less from your hand without paying its mana cost."
Kari Zev's Expertise88%
$1.34↑#6844↑0.05↓9.6 years
"You may cast a spell with mana value 2 or less from your hand without paying its mana cost."
Epistolary Librarian86%
$0.37↓#13934↓0.00↓3.9 years↓
"Whenever this creature attacks, you may cast a spell with mana value X or less from your hand without paying its mana cost, where X is the number of attacking creatures."
Electrodominance86%
$0.43↑#1397↑0.28↓7.6 years↓
"this card deals X damage to any target. You may cast a spell with mana value X or less from your hand without paying its mana cost."
Languish84%
$0.34↓#5680↑0.19↓11.1 years↑
"All creatures get -4/-4 until end of turn."
Infest84%
$0.13↓#21635↓0.05↓23.9 years↑
"All creatures get -2/-2 until end of turn."
Nausea84%
$0.03↓#17556↓0.00↓28.2 years↑
"All creatures get -1/-1 until end of turn."
Shrivel84%
$0.10↓#18243↓0.24↓16.4 years↑
"All creatures get -1/-1 until end of turn."
Blight Grenade83%
$0.38↓#12213↓0.05↓3.9 years↓
"All creatures get -3/-3 until end of turn."
Toxic Deluge82%
$4.49↑#67↑0.87↑12.8 years↑
"All creatures get -X/-X until end of turn."
Planar Despair82%
$0.16↓#29423↓0.12↓25.3 years↑
"All creatures get -1/-1 until end of turn for each basic land type among lands you control."
Reinterpret82%
$0.43↑#97100.87↑5.4 years↓
"Counter target spell. You may cast a spell with equal or lesser mana value from your hand without paying its mana cost."
Night of Souls' Betrayal81%
$2.02↑#10440↓0.91↑21.9 years↑
"All creatures get -1/-1."
Omniscience81%
$6.14↑#1022↑1.72↑14.1 years↑
"You may cast spells from your hand without paying their mana costs."
Kaervek, the Spiteful80%
$0.28↓#99990.386.2 years↓
"Other creatures get -1/-1."
Mephitic Vapors80%
$0.11↓#20591↓0.367.9 years↓
"All creatures get -1/-1 until end of turn."
Lady Octopus, Inspired Inventor79%
$0.77↑#5514↑0.63↑1.0 years↓
"
: You may cast an artifact spell from your hand with mana value less than or equal to the number of ingenuity counters on this card without paying its mana cost."
: You may cast an artifact spell from your hand with mana value less than or equal to the number of ingenuity counters on this card without paying its mana cost."
Hideous Laughter78%
$0.20↓#25202↓0.30↓21.9 years↑
"All creatures get -2/-2 until end of turn."