Moonsilver Dragon

Flying, Haste
Whenever Moonsilver Dragon attacks, create
3 Treasure Tokens on your side of the
battlefield. Moonsilver Dragon gains +1/+1 for
each Treasure Token you control.
If you control 10 or more Treasure Tokens,
Moonsilver Dragon gains Double Strike,
Hexproof, and "All other Dragons you control
gain +1/+1 for each Treasure Token you
control."