Aegis of the Legion 
Artifact — Equipment
$1.84 #14444 0.21 2.5 years
Equipped creature gets +1/+1 and has mentor. (Whenever it attacks, put a +1/+1 counter on target attacking creature with lesser power.)
Whenever equipped creature mentors a creature, put a shield counter on that creature. (If that creature would be dealt damage or destroyed, remove a shield counter from it instead.)
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Cards similar to Aegis of the Legion expected a card that isn't here?
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Nyxborn Unicorn72%
$0.20↓#128140.06↓2.2 years
"Enchanted creature gets +2/+2 and has mentor."
+1 more matching line