Iron Man, Armored Avenger 

Legendary Artifact Creature — Human Hero
Flying
Whenever you draw a card, put a +1/+1 counter on target creature.
Whenever Iron Man attacks, other attacking modified creatures gain flying until end of turn. (Equipment, Auras you control, and counters are modifications.)
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Cards that do something similar expected a card that isn't here?
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Lyla, Holographic Assistant 100%
$5.83#6974
"Whenever you draw a card, put a +1/+1 counter on target creature."
Wizard Class 90%
$2.87#634
"Whenever you draw a card, put a +1/+1 counter on target creature you control."
Nogi, Draco-Zealot 88%
$0.47#4831
"Whenever this card attacks, if you control three or more Dragons, until end of turn, this card becomes a Dragon with base power and toughness 5/5 and gains flying."
Thunderhawk Gunship 86%
$15.86#3510
"Whenever this Vehicle attacks, attacking creatures you control gain flying until end of turn."
Vulture, Scheming Scavenger 85%
$0.22#14519
"Whenever this card attacks, other Villains you control gain flying until end of turn."
Victory's Herald 83%
$0.32#11328
"Whenever this creature attacks, attacking creatures gain flying and lifelink until end of turn."
Roxxon Brutes 80%
$0.11#23713
"Whenever you draw your second card each turn, put a +1/+1 counter on target creature."
Thunderous Orator 80%
$0.21#19631
"Whenever this creature attacks, it gains flying until end of turn if you control a creature with flying. The same is true for first strike, double strike, deathtouch, indestructible, lifelink, menace, and trample."