Dragon Scales 

Enchantment — Aura
Enchant creature
Enchanted creature gets +1/+2 and has vigilance.
When a creature with mana value 6 or greater enters, you may return this card from your graveyard to the battlefield attached to that creature.
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Cards that do something similar expected a card that isn't here?
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Dragon Shadow 100%
$0.18#15706
"When a creature with mana value 6 or greater enters, you may return this card from your graveyard to the battlefield attached to that creature."
+1 more matching line
Dragon Fangs 100%
$0.21#17491
"When a creature with mana value 6 or greater enters, you may return this card from your graveyard to the battlefield attached to that creature."
+2 more matching lines
Dragon Wings 100%
$0.15#20614
"When a creature with mana value 6 or greater enters, you may return this card from your graveyard to the battlefield attached to that creature."
Dragon Breath 100%
$0.15#17033
"When a creature with mana value 6 or greater enters, you may return this card from your graveyard to the battlefield attached to that creature."
Radiant Grace // Radiant Restraints 99%
$0.20#12645
"Enchanted creature gets +1/+0 and has vigilance."
+1 more matching line
Sentinel's Eyes 99%
$0.25#6523
"Enchanted creature gets +1/+1 and has vigilance."
+1 more matching line
Marked by Honor 91%
$0.06#22228
"Enchanted creature gets +2/+2 and has vigilance."
+1 more matching line
Howl of the Hunt 91%
$0.22#15217
"Enchanted creature gets +2/+2 and has vigilance."
+1 more matching line
Knightly Valor 91%
$0.18#14605
"Enchanted creature gets +2/+2 and has vigilance."
+1 more matching line
Favor of the Overbeing 81%
$0.45#8198
"As long as enchanted creature is green, it gets +1/+1 and has vigilance."