Sianhana, Arahbo's Legacy

Sianhana, Arahbo's Legacy can't be countered.
Sianhana, Arahbo's Legacy gets +1/+0 for each Cat creature you control.
If you control 7 or more Cats, Sianhana, Arahbo's Legacy gains hexproof.
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"If you fight for what is right, leadership can come in many different sizes." -Arahbo to Gideon