Piper, Loyal Companion

Piper, Loyal Companion gets +2/+0 and has
flying as long as you control another legendary
creature.
Whenever a legendary creature you control deals
damage to a player, create a Treasure token. (It's
an artifact with "{t}, Sacrifice this artifact: Add one
mana of any color.")
"He only needs encouragement anyway."
—Shelly Blackwater