Seismic Tutelage 
Enchantment — Aura
$0.90 #11095 0.31 0.9 years
Enchant creature
When this Aura enters, put a +1/+1 counter on enchanted creature.
Whenever enchanted creature attacks, double the number of +1/+1 counters on it.
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Hydra's Growth98%
$1.23↑#2156↑0.346.7 years↑
"When this Aura enters, put a +1/+1 counter on enchanted creature."
+2 more matching lines
Level Up98%
$1.70↑#3963↑0.60↑0.6 years
"When this Aura enters, put a +1/+1 counter on enchanted creature."
+2 more matching lines
Fractal Harness91%
$0.25↓#6379↑0.295.5 years↑
"Whenever equipped creature attacks, double the number of +1/+1 counters on it."
+1 more matching line
Sword of Hours88%
$5.43↑#5102↑0.00↓5.2 years↑
"Whenever equipped creature attacks, put a +1/+1 counter on it."
Byrke, Long Ear of the Law87%
$7.22↑#6029↑0.14↓2.2 years↑
"Whenever a creature you control with a +1/+1 counter on it attacks, double the number of +1/+1 counters on it."
Lily Bowen, Raging Grandma84%
$0.46↓#7080↑0.252.6 years↑
"this card enters with two +1/+1 counters on it."
Ornery Tumblewagg84%
$0.36↓#5181↑0.222.5 years↑
"Whenever this creature attacks while saddled, double the number of +1/+1 counters on target creature."
Mossborn Hydra83%
$13.45↑#747↑0.95↑1.9 years↑
"This creature enters with a +1/+1 counter on it."
Primordial Hydra83%
$1.37↑#2429↑0.55↑15.3 years↑
"This creature enters with X +1/+1 counters on it."
+1 more matching line
Armory of Iroas82%
$0.23↓#8026↑0.2712.5 years↑
"Whenever equipped creature attacks, put a +1/+1 counter on it."
Bone Sabres82%
$4.79↑#6114↑0.07↓4.0 years↑
"Whenever equipped creature attacks, put four +1/+1 counters on it."
Ascendant Acolyte81%
$0.32↓#112860.294.7 years↑
"This creature enters with a +1/+1 counter on it for each +1/+1 counter among other creatures you control."
+1 more matching line
Shape of the Wiitigo80%
$0.34↓#25610↓0.3220.2 years↑
"When this Aura enters, put six +1/+1 counters on enchanted creature."
+1 more matching line
Kalonian Hydra80%
$6.14↑#1136↑0.48↑13.3 years↑
"Whenever this creature attacks, double the number of +1/+1 counters on each creature you control."
+1 more matching line
Sazh Katzroy78%
$0.51↓#5119↑0.251.4 years
"Whenever this card attacks, put a +1/+1 counter on target creature, then double the number of +1/+1 counters on that creature."
Bright-Palm, Soul Awakener78%
$0.28↓#98180.20↓3.5 years↑
"Whenever this creature attacks, double the number of +1/+1 counters on target creature. That creature can't be blocked by creatures with power 2 or less this turn."
Curse of Predation77%
$0.19↓#14619↓0.3313.0 years↑
"Whenever a creature attacks enchanted player, put a +1/+1 counter on it."
Forced Adaptation77%
$0.14↓#8490↑0.00↓13.7 years↑
"At the beginning of your upkeep, put a +1/+1 counter on enchanted creature."
Sisterhood of Karn76%
$0.23↓#124100.373.0 years↑
"This creature enters with a +1/+1 counter on it."
Big Mother Mouser76%
$1.28↑#4796↑0.310.6 years
"Whenever this creature attacks, double the number of +1/+1 counters on it."
+1 more matching line