Herald of Amity {3}{W}
Creature — Griffin
Flying
When this creature enters, exile the top eight cards of your library. You may cast an Aura spell from among them without paying its mana cost. Then put the rest on the bottom of your library in a random order.
Whenever this creature attacks, it gets +X/+X until end of turn, where X is the number of Auras you control.
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Cards that do something similar expected a card that isn't here?
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The Long Reach of Night // Animus of Night's Reach 85%
$0.22#11099
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the number of creature cards in defending player's graveyard."
Kuldotha Cackler 85%
$0.05#22471
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the number of permanents you control with oil counters on them."
Bull Aurochs 84%
$0.07#29855
"Whenever this creature attacks, it gets +1/+0 until end of turn for each other attacking Aurochs."
Rimehorn Aurochs 84%
$0.13#25135
"Whenever this creature attacks, it gets +1/+0 until end of turn for each other attacking Aurochs."
Aurochs Herd 84%
$0.07#30029
"Whenever this creature attacks, it gets +1/+0 until end of turn for each other attacking Aurochs."
Impetuous Protege 84%
$0.19#27019
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the greatest power among tapped creatures your opponents control."
Reckless Pangolin 84%
$0.12#31018
"Whenever this creature attacks, it gets +1/+1 until end of turn."
Redemptor Dreadnought 84%
$0.34#16858
"Whenever this creature attacks, if a card is exiled with it, it gets +X/+X until end of turn, where X is the power of the exiled card."
Heir of the Wilds 83%
$0.24#16000
"Whenever this creature attacks, if you control a creature with power 4 or greater, this creature gets +1/+1 until end of turn."
Pyreswipe Hawk 83%
$0.27#8765
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the greatest mana value among artifacts you control."
Slimy Piper 82%
$0.28#19663
"Whenever this creature attacks, it gets +1/+1 until end of turn. If you control four or more creatures, it gets +2/+2 and gains indestructible until end of turn instead."
Sardian Avenger 82%
$1.62#7610
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the number of artifacts your opponents control."