Vedas are highest in hierarchy of Sanathan dharma.
Most celebrated avatars never deny Vedas and in fact followed and authorised Vedas.
Is there any possibility of an anti-Vedic avatar?
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Buddha is an avatar of Lord Vishnu and he deluded asuras by refusing Vedas.
Then in the Kali age, the lord was born in the Kikatas as Buddha. He deluded the asuras and flouted the Vedas.