Study the Classics 
Sorcery
$0.25 #15091 0.46 0.6 years
Put a +1/+1 counter on target creature, then double the number of +1/+1 counters on it. You gain life equal to the number of +1/+1 counters on that creature.
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Invigorating Surge91%
$0.25#3614↑0.19↓6.3 years↑
"Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on that creature."
Growth Curve90%
$0.30↑#9609↑0.21↓0.5 years
"Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on that creature."
Fangs of Kalonia86%
$0.33↑#2569↑0.22↓2.3 years↑
"Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on each creature that had a +1/+1 counter put on it this way."
Visions of Dominance86%
$0.67↑#7949↑0.33↓5.1 years↑
"Put a +1/+1 counter on target creature, then double the number of +1/+1 counters on it."
Biogenic Upgrade86%
$0.12↓#9109↑0.13↓7.7 years↑
"Distribute three +1/+1 counters among one, two, or three target creatures, then double the number of +1/+1 counters on each of those creatures."
Branching Evolution83%
$6.88↑#376↑0.58↑6.3 years↑
"If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on that creature instead."
Lily Bowen, Raging Grandma82%
$0.46↑#7080↑0.25↓2.6 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on this card if its power is 16 or less. Otherwise, remove all but one +1/+1 counter from it, then you gain 1 life for each +1/+1 counter removed this way."
Corpsejack Menace82%
$0.33↑#1570↑0.30↓14.0 years↑
"If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on it instead."
Sage of the Fang81%
$0.19↓#146070.07↓1.5 years
"When this creature enters, put a +1/+1 counter on target creature."
Solidarity of Heroes80%
$0.39↑#6313↑0.18↓12.5 years↑
"Choose any number of target creatures. Double the number of +1/+1 counters on each of them."
The Earth Crystal80%
$12.45↑#678↑0.461.4 years
"If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on that creature instead."
Shang-Chi, Martial Mentor80%
$0.69↑#171820.510.3 years
"If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on that creature instead."
Vigorbloom Vanguard // Seed Suture78%
$0.16↓#19798↓0.12↓0.0 years
"Put a +1/+1 counter on target creature. You gain 1 life."
Tanazir Quandrix78%
$0.32↑#8363↑0.86↑5.5 years↑
"When this card enters, double the number of +1/+1 counters on target creature you control."
Ascendant Acolyte78%
$0.32↑#11286↑0.29↓4.7 years↑
"This creature enters with a +1/+1 counter on it for each +1/+1 counter among other creatures you control."
Ornery Tumblewagg76%
$0.36↑#5181↑0.22↓2.5 years↑
"At the beginning of combat on your turn, put a +1/+1 counter on target creature."
Adventurous Eater // Have a Bite76%
$0.08↓#18145↓0.01↓0.5 years
"Put a +1/+1 counter on target creature. You gain 1 life."
Emergency Phytomedic // Seed Suture76%
$0.18↓#22134↓0.04↓0.0 years
"Put a +1/+1 counter on target creature. You gain 1 life."
Voracious Hydra76%
$0.26↑#2749↑0.28↓7.3 years↑
"• Double the number of +1/+1 counters on this creature."
Blossom-Blessed Angel // Seed Suture76%
$0.13↓#23578↓0.06↓0.0 years
"Put a +1/+1 counter on target creature. You gain 1 life."