Choosing enchantments that build momentum keeps your Commander deck consistent, especially against removal or the grind of late game
Think about if you have 10 creatures out, 3 of which have life drain effects
You do have to reveal the Goblin you find off Goblin Matron, but the ability to grab what you need is too good to pass up
Just as they arrive, Tinker Bell gets free and shoots off with it
Provided cake is a combat trick, of course
Of course, this is made easier by the fact that each deck contains a Sol Ring (#1 card in Commander) and a Commander's Sphere (#3 card in Commander), but Open Hostility gets both Skullclamp and Lightning Greaves, which rank in the top 20 cards in Commander