Momentum 

Enchantment — Aura
Enchant creature
At the beginning of your upkeep, you may put a growth counter on this Aura.
Enchanted creature gets +1/+1 for each growth counter on this Aura.
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Private Research 89%
$0.31#22921
"At the beginning of your upkeep, you may put a page counter on this Aura."
Endless Scream 88%
$0.16#20103
"Enchanted creature gets +1/+0 for each scream counter on this Aura."
+1 more matching line
Tourach's Gate 88%
$0.71#30231
"At the beginning of your upkeep, remove a time counter from this Aura. If there are no time counters on this Aura, sacrifice it."
Archery Training 88%
$0.19#18955
"At the beginning of your upkeep, you may put an arrow counter on this Aura."
Sage's Reverie 86%
$0.25#1805
"Enchanted creature gets +1/+1 for each Aura you control that's attached to a creature."
+1 more matching line
Glacial Plating 85%
$0.25#19838
"Enchanted creature gets +3/+3 for each age counter on this Aura."
+1 more matching line
Incendiary 84%
$0.33#24385
"At the beginning of your upkeep, you may put a fuse counter on this Aura."
+1 more matching line