Cyrus, the Papyrus

Humans in your deck are "Egyptian Worshippers"
in addition to their other types.
Whenever an activated ability triggers an Egyptian Worshipper to get +X/+X, you may negate that effect, and instead, search your library to put an
Egyptian Worshipper onto the battlefield tapped.
If an Egyptian Worshipper ETB, you may return
it to your hand; give creatures you control +X/+X,
where X is the CMC of that card.