Bad spell involving chickens (Wilson’s Chicken)

Okay, I’ve haven’t played DnD but I am interested so my and if I get something wrong such as the spell’s level. So, you require a chicken’s egg for the material component, and the verbal component is “chicken.” With this spell, you throw the egg and roll a d10, 1 and the egg hits the ground and acts like a normal egg, 2-4 and you summon the illusion of a normal chicken wherever the egg lands, 5-8 and you summon the chicken as usual, however, it is under the influence of an illusion spell and looks like a 20 foot tall chicken from hell, covers in flaming feathers, igniting everything around it (not for reals, though, this is just an illusion, after 3 minutes the chicken reverts back to its normal state and remains for an extra 3 minutes before leaving our plane of existence.) 8-10, the chicken summoned lays an egg and effectively cast this spell again.

Background: Wilson, a very powerful illusionist with too much time on his hands, once decided “You know what, I want a chicken that scares the $*%^ out of my enemies.” Wilson then proceeds to spend the next 3 years of his life and all of his parties savings on perfecting a spell designed for this purpose, some of the time.