Life is a resource in Magic: The Gathering, like anything else, so be sure to spend it if you feel like it will draw you into your game-winning card or combo
The possibilities are endless, which is what makes this cycle so exciting in a hypothetical post-change world
Between protection from blue and black, both of which have decent creature removal in different forms, and the card advantage of the on-damage ability, there isnt much this Sword leaves you wanting
This Adventurer's real power comes from when it attacks, letting you exile the top card of your library and play it this turn
Another essential ingredient is some efficient, traditional early game interaction spot removal, counterspells, defensive instants, even board wipes
Given how cheap the initial cost is and the big impact it has, leveling up this enchantment doesn't need to be a priority, but if you have a few creatures on the battlefield and want to let your hand build back up, you can focus on pumping mana into upgrades