Inexorable Tide 
Enchantment
$1.13 #1036 0.66 15.9 years
Whenever you cast a spell, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
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Cards similar to Inexorable Tide expected a card that isn't here?
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Flux Channeler93%
$2.28↑#1303↓0.34↓7.3 years↓
"Whenever you cast a noncreature spell, proliferate."
Atraxa, Praetors' Voice88%
$24.32↑#2475↓1.72↑9.8 years↓
"At the beginning of your end step, proliferate."
Metastatic Evangel81%
$0.37↓#1514↓0.33↓2.2 years↓
"Whenever another nontoken creature you control enters, proliferate."
Thrummingbird79%
$0.25↓#8450.22↓15.9 years
"Whenever this creature deals combat damage to a player, proliferate."
Tainted Observer76%
$0.22↓#7047↓0.47↓3.6 years↓
"Whenever another creature you control enters, you may pay 
. If you do, proliferate."
. If you do, proliferate."
Ichormoon Gauntlet76%
$5.52↑#2972↓0.623.6 years↓
"Whenever you cast a noncreature spell, choose a counter on target permanent. Put an additional counter of that kind on that permanent."
Bloated Contaminator72%
$3.28↑#2593↓0.683.6 years↓
"Whenever this creature deals combat damage to a player, proliferate."
Patrolling Peacemaker72%
$0.63↓#2149↓0.45↓1.1 years↓
"Whenever an opponent commits a crime, proliferate."
Brimaz, Blight of Oreskos70%
$0.42↓#7499↓0.47↓3.4 years↓
"At the beginning of each end step, if a Phyrexian died under your control this turn, proliferate."
Dreamtide Whale70%
$2.91↑#12010.36↓2.2 years↓
"Whenever a player casts their second spell each turn, proliferate."