Cloister Gargoyle 

Artifact Creature — Gargoyle
$0.20 #14050 0.20 5.1 years
When this creature enters, venture into the dungeon. (Enter the first room or advance to the next room.)
As long as you've completed a dungeon, this creature gets +3/+0 and has flying.
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"As long as you control another multicolored permanent, this creature gets +1/+1 and has flying."
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"This creature has flying as long as it has a +1/+1 counter on it."