Inexorable Tide 
Enchantment
$0.91 #996 0.58 16.1 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%
$2.61↑#1248↓0.567.5 years↓
"Whenever you cast a noncreature spell, proliferate."
Atraxa, Praetors' Voice87%
$26.03↑#2362↓1.77↑9.9 years↓
"At the beginning of your end step, proliferate."
Metastatic Evangel80%
$0.37↓#1514↓0.30↓2.3 years↓
"Whenever another nontoken creature you control enters, proliferate."
Thrummingbird80%
$0.25↓#8290.30↓16.1 years
"Whenever this creature deals combat damage to a player, proliferate."
Tainted Observer76%
$0.27↓#7212↓0.39↓3.7 years↓
"Whenever another creature you control enters, you may pay 
. If you do, proliferate."
. If you do, proliferate."
Edgar, Moonlit Sovereign74%
$0.22↓#24175↓0.08↓0.0 years↓
"At the beginning of your end step, if you didn't cast a spell this turn, put two +1/+1 counters on this card."
Ichormoon Gauntlet73%
$15.57↑#2564↓1.05↑3.7 years↓
"Whenever you cast a noncreature spell, choose a counter on target permanent. Put an additional counter of that kind on that permanent."
Patrolling Peacemaker73%
$1.00↑#2022↓0.40↓1.2 years↓
"Whenever an opponent commits a crime, proliferate."
Bloated Contaminator72%
$3.23↑#2623↓0.653.7 years↓
"Whenever this creature deals combat damage to a player, proliferate."
The Thing70%
$0.37↓#15354↓0.42↓0.3 years↓
"At the beginning of combat on your turn, if you've cast a noncreature spell this turn, put four +1/+1 counters on this card."
Dreamtide Whale70%
$3.42↑#11870.39↓2.3 years↓
"Whenever a player casts their second spell each turn, proliferate."
Brimaz, Blight of Oreskos70%
$0.40↓#7605↓0.24↓3.5 years↓
"At the beginning of each end step, if a Phyrexian died under your control this turn, proliferate."