Beastmaster Ascension 

Enchantment
Whenever a creature you control attacks, you may put a quest counter on this enchantment.
As long as this enchantment has seven or more quest counters on it, creatures you control get +5/+5.
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Cards that do something similar expected a card that isn't here?
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Quest for the Goblin Lord 92%
$1.72#7318
"As long as this enchantment has five or more quest counters on it, creatures you control get +2/+0."
Firebender Ascension 86%
$0.68#2919
"Whenever a creature you control attacking causes a triggered ability of that creature to trigger, put a quest counter on this enchantment. Then if it has four or more quest counters on it, you may copy that ability. You may choose new targets for the copy."
Druids' Repository 85%
$3.25#6898
"Whenever a creature you control attacks, put a charge counter on this enchantment."
Waterbender Ascension 83%
$0.81#4110
"Whenever a creature you control deals combat damage to a player, put a quest counter on this enchantment. Then if it has four or more quest counters on it, draw a card."
ED-E, Lonesome Eyebot 83%
$0.31#9176
"Whenever you attack, if the number of attacking creatures is greater than the number of quest counters on this card, put a quest counter on it."