Tabby Slime

Slimefall—Whenever a Slime enters the battlefield under your control,
put a 1/1 Chicken token onto the battlefield.
When this card attacks, create 2 1/1 Chicken tokens.
{u/b}{b}{b}{u}:Create a 1/1 Chicken token.
This card gains +1/+1 for each Chicken token
on the battlefield.