Smaug, Overtaker of Erebor

Flying
When Smaug enters the battlefield, create five treasure tokens. If you sacrifice a treasure token,
put a +1/+1 counter on Smaug, At 3 sacrificed,
add Menace to Smaug, At 4 sacrificed, add
Double Strike to Smaug, at 5 sacrificed, add Indestructible to Smaug.