Horde Of Chihuahua's

Vigilance
Everytime this card attacks, add 2 Chihuahua's with 2 life, 2 attack.
When Horde of Chihuahua's enters the battlefield, add 2 Chihuahua's with 1 life, 1 attack.
{4}{x} add {x} amount of Chihuahua's with 2 life, 2 attack