Alduin, Firstborn of Akatosh

Flying
Whenever Alduin, Firstborn of Akatosh attacks,
put a +1/+1 counter on up to two target
creatures you control or proliferate.
Sacrifice a nontoken dragon you control: Alduin
gains hexproof until end of turn.
End of the Kalpa - Sacrifice four lands you
control: Exile Alduin, Firstborn of Akatosh and
return it to the battlefield transformed. Only do
this if Alduin has ten or more +1/+1 counters on
it.