Whether thats one of the Karador decks, Old Stickfingers, or any of a number of other decks in which I like to mess with the graveyard, Sword of Once and Future will star
On one its a Shock, at two its a Lightning Strike, at three its a painless Char, and from four mana onwards it actually outperforms set damage spells such as Lightning Blast or Lava Axe
In Commander, where starting life totals are 40, two damage is essentially irrelevant
By sacrificing Blood tokens or other creatures, she drains life from opponents and provides card filtering
There are also creatures that make enchantments cheaper, such as Herald of the Pantheon, which also provide huge discounts to our deck if we cast multiple enchantments per turn