Aun'Va, The Ethereal Supreme

Defender
All T'au spells you cast cost {1} less to cast.
Other T'au creatures you control get +1/+1.
When Aun'Va, The Ethereal Supreme leaves the battlefield, tap all T'au creatures you control.
Through his inspirational presence Aun'Va pushes
even the greenest Shas'La to deeds of heroism
that almost defy belief.