Enchant creature
When Hammerhand enters the battlefield, target creature can't block this turn.
Enchanted creature gets +1/+1 and has haste. (It can attack and no matter when it came under your control.)
Flying
When Hoarding Dragon enters the battlefield, you may search your library for an artifact card, exile it, then shuffle your library.
When Hoarding Dragon dies, you may put the exiled card into its owner's hand.
Put a +1/+1 counter on target creature you control. Then that creature fights target creature you don't control. (Each deals damage equal to its power to the other.)
Dragons scorn the weak, even among their own kind.