Flying
Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
Other creatures you control have exalted. (If a creature has multiple instances of exalted, each triggers separately.)
Whenever a creature you control attacks alone, count the number of instances of exalted among permanents you control. After those abilities resolve, that’s how many times the creature will get +1/+1.