Beast King Antharos

Pierce. Skirmish.
You may play this card at {r} cost, but it's power
and toughness are halved.
When you play this creature, you can discard 1
card; ready 1 friendly creature.
While this creature is in play, all "Beast King" creatures gain Pierce and Skirmish.
When this creature is played at full cost, your opponent discards 1 card.