Primal Cocoon 
Enchantment — Aura
$0.19 #24568 0.20 16.3 years
Enchant creature
At the beginning of your upkeep, put a +1/+1 counter on enchanted creature.
When enchanted creature attacks or blocks, sacrifice this Aura.
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Forced Adaptation90%
$0.14↓#8490↑0.00↓13.7 years↓
"At the beginning of your upkeep, put a +1/+1 counter on enchanted creature."
Vebulid85%
$0.73↑#264830.06↓28.0 years↑
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
+1 more matching line
Mardu Blazebringer81%
$0.04↓#31003↓0.00↓12.1 years↓
"When this creature attacks or blocks, sacrifice it at end of combat."
Fog Elemental80%
$0.09↓#29554↓0.05↓29.4 years↑
"When this creature attacks or blocks, sacrifice it at end of combat."
Ferocity78%
$0.19#243850.06↓27.0 years↑
"Whenever enchanted creature blocks or becomes blocked, you may put a +1/+1 counter on it."
Daily Regimen77%
$0.13↓#226320.09↓18.7 years↑
"
: Put a +1/+1 counter on enchanted creature."
: Put a +1/+1 counter on enchanted creature."+1 more matching line
Rotting Giant77%
$0.33↑#31468↓0.00↓25.1 years↑
"Whenever this creature attacks or blocks, sacrifice it unless you exile a card from your graveyard."
Ceremonial Guard77%
$0.04↓#32191↓0.00↓27.0 years↑
"When this creature attacks or blocks, destroy it at end of combat."
Cunning76%
$0.07↓#30719↓0.00↓28.3 years↑
"When enchanted creature attacks or blocks, sacrifice this Aura at the beginning of the next cleanup step."
+1 more matching line
Loxodon Battle Priest76%
$0.17↓#18609↑0.05↓1.5 years↓
"At the beginning of combat on your turn, put a +1/+1 counter on another target creature you control."
Clockwork Vorrac76%
$0.11↓#253380.31↑23.0 years↑
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
Seismic Tutelage74%
$0.90↑#11095↑0.31↑0.9 years↓
"When this Aura enters, put a +1/+1 counter on enchanted creature."
+1 more matching line
Shape of the Wiitigo74%
$0.34↑#256100.32↑20.2 years↑
"When this Aura enters, put six +1/+1 counters on enchanted creature."
+1 more matching line
Armory of Iroas74%
$0.23↑#8026↑0.2712.5 years↓
"Whenever equipped creature attacks, put a +1/+1 counter on it."
Bone Sabres74%
$4.79↑#6114↑0.07↓4.0 years↓
"Whenever equipped creature attacks, put four +1/+1 counters on it."
Runaway Carriage73%
$0.06↓#285740.00↓10.5 years↓
"When this creature attacks or blocks, sacrifice it at end of combat."
Hydra's Growth72%
$1.23↑#2156↑0.34↑6.7 years↓
"At the beginning of your upkeep, double the number of +1/+1 counters on enchanted creature."
+1 more matching line
Sinister Possession72%
$0.08↓#18637↑0.1413.5 years↓
"Whenever enchanted creature attacks or blocks, its controller loses 2 life."
Contaminated Bond72%
$0.11↓#200010.1223.0 years↑
"Whenever enchanted creature attacks or blocks, its controller loses 3 life."
+1 more matching line
Level Up72%
$1.70↑#3963↑0.60↑0.6 years↓
"When this Aura enters, put a +1/+1 counter on enchanted creature."
+1 more matching line