Study the Classics 
Sorcery
$0.27 #15761 0.00 0.5 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%
$0.24↓#3540↑0.21↑6.2 years↑
"Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on that creature."
Growth Curve90%
$0.27#10370↑0.000.4 years
"Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on that creature."
Fangs of Kalonia87%
$0.34↑#2507↑0.25↑2.2 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%
$0.77↑#7759↑0.13↑4.9 years↑
"Put a +1/+1 counter on target creature, then double the number of +1/+1 counters on it."
Biogenic Upgrade86%
$0.12↓#8980↑0.43↑7.6 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%
$6.36↑#370↑0.44↑6.1 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%
$0.51↑#6967↑0.002.5 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%
$0.36↑#1552↑0.35↑13.9 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 Fang82%
$0.22↓#145650.11↑1.4 years
"When this creature enters, put a +1/+1 counter on target creature."
Solidarity of Heroes80%
$0.65↑#6186↑0.18↑12.3 years↑
"Choose any number of target creatures. Double the number of +1/+1 counters on each of them."
Shang-Chi, Martial Mentor80%
$0.61↑#183570.000.2 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."
The Earth Crystal80%
$13.76↑#723↑0.42↑1.2 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."
Tanazir Quandrix78%
$0.28↑#8451↑0.44↑5.4 years↑
"When this card enters, double the number of +1/+1 counters on target creature you control."
Ascendant Acolyte78%
$0.34↑#10992↑0.064.5 years↑
"This creature enters with a +1/+1 counter on it for each +1/+1 counter among other creatures you control."
Adventurous Eater // Have a Bite77%
$0.11↓#19885↓0.000.4 years
"Put a +1/+1 counter on target creature. You gain 1 life."
Michelangelo, Weirdness to 1177%
$2.57↑#5190↑0.000.5 years
"If one or more +1/+1 counters would be put on a creature you control, that many plus one +1/+1 counters are put on it instead."
Ornery Tumblewagg76%
$0.34↑#4990↑0.90↑2.4 years↑
"At the beginning of combat on your turn, put a +1/+1 counter on target creature."
Voracious Hydra76%
$0.28↑#2738↑0.29↑7.2 years↑
"• Double the number of +1/+1 counters on this creature."
The First Tyrannic War76%
$0.66↑#11145↑0.33↑3.9 years↑
"Double the number of each kind of counter on target creature you control."
Primal Vigor74%
$6.20↑#1212↑0.49↑12.8 years↑
"If one or more +1/+1 counters would be put on a creature, twice that many +1/+1 counters are put on that creature instead."