Nishu, the Battleweary

Immortal (Spells and abilities cannot reduce
this creature's toughness less than 1)
You may exert Nishu, the Battleweary as it
attacks. When you do, it gets indestructible until
end of turn.
Whenever combat damage is dealt to Nishu, the Battleweary, you may pay {r}{w}. If you do, Nishu
deals that much damage to the creature dealing
the damage.