I do not see any Wild Shape feature anywhere for you to meet the prerequisites for 'Aspect of the Beast'. Please explain.

Copied straight from the SRD

Slayer Talents: As a slayer gains experience, he learns a number of talents that aid him and confound his foes. Starting at 2nd level and every 2 levels thereafter, a slayer gains one slayer talent. Unless otherwise noted, a slayer cannot select an individual talent more than once.

Ranger Combat Style (Ex): The slayer selects a ranger combat style (such as archery or two-weapon combat) and gains a combat feat from the 1st-level feat choices for that style. He can choose feats from his chosen combat style, even if he does not meet the prerequisites. At 6th level, he may select this talent again and add the 6th-level ranger combat feats from his chosen style to the style's feat list. At 10th level, he may select this talent again and add the 10th-level ranger combat feats from his chosen style to the style's feat list.

-- New COmbat Styles -- (advanced players guide)

New Combat Styles

At 2nd level, a ranger must select one of the two core combat styles or one of the following new combat styles: crossbow, mounted combat, natural weapon, two-handed weapon, or weapon and shield style. The ranger can choose feats from his selected combat style even if he does not have the normal prerequisites.

Crossbow: If the ranger selects crossbow style, he can choose from the following list whenever he gains a combat style feat: Deadly Aim, Focused Shot, Precise Shot, and Rapid Reload. At 6th level, he adds Crossbow Mastery and Improved Precise Shot to the list. At 10th level, he adds Pinpoint Targeting and Shot on the Run to the list.

Mounted Combat: If the ranger selects mounted combat, he can choose from the following list whenever he gains a combat style feat: Mounted Combat, Mounted Archery, Ride-By Attack, and Trick Riding. At 6th level, he adds Mounted Shield and Spirited Charge to the list. At 10th level, he adds Mounted Skirmisher and Unseat to the list.

Natural Weapon: If the ranger selects natural weapon style, he can choose from the following list whenever he gains a combat style feat: Aspect of the Beast, Improved Natural Weapon, Rending Claws, and Weapon Focus. At 6th level, he adds Eldritch Fangs and Vital Strike to the list. At 10th level, he adds Multiattack and Improved Vital Strike to the list.

Two-Handed Weapon: If the ranger selects two-handed weapon style, he can choose from the following list whenever he gains a combat style feat: Cleave, Power Attack, Pushing Assault, and Shield of Swings. At 6th level, he adds Furious Focus and Great Cleave to the list. At 10th level, he adds Dreadful Carnage and Improved Sunder to the list.

Aspoect of the beast

Special: A ranger who selects the natural weapon combat style can take this feat without having to meet the prerequisites (even if he does not select Aspect of the Beast as a bonus feat).

Wow.

Sanctioned.