Dragon of lost Cold

Flying, hexproof, dubblestrike
in your upkeep, you may pay {u}{u}, if you do,
Dragon of lost Cold gets an +1/+1 counter.
when Dragon of lost Cold attacks, move next
turn to 3 cards below the top card of your
library, you get X treasure token artifacts, where
X is the amount of +1/+1 tokens Dragon of lost
Cold had when removed from the battlefield.