Virae, The Bounty Hunter

Menace, First Strike Hexproof
Affinity for Aetherborns(This spell costs 1 less
to cast for each Aetherborn you control)
Whenever a Aetherborn Creature you control
attacks, create a Treasure and you get an
Experience Counter. At the beginning of combat
once each turn, your Aetherborn Creatures get X
+1/+1 until end of turn, where X is the number
of Experience Counters you have.