There are very few cards that do that
Legendary Enchantment Tezzeret, Betrayer of Flesh The first activated ability of an artifact you activate each turn costs less to activate
6) Aura of Need This is my default name for a global enchantment, especially if it's white
Robin Hood is your secret weapon Robin Hood Champion of Sherwood is one of the best cards in Into the Inklands, and virtually ever Steel deck now uses him
Remember, there are better, more meta ways to build an Emerald/Steel deck, but this list maintains the core Robin Hood/Hyena/Ping identity
Even better, if the creature that Strength-Testing hammer is attached to has the highest power on the battlefield, you get to draw a card when that creature attacks