Before you even play it, you can cast Faith & Grief, its Adventure half, to return up to two enchantments or artifacts from your graveyard to your hand
Loot, the Pathfinder is a relevant haste body that can dish out extra damage, kill a guy, draw three cards, or even generate more mana
Then you get to choose how creatures block each combat, letting you pick the most favorable blocks for you and the worst for your opponent
Force of Negation This, can't be used free on your turn, but it exiles the target, which occasionally matters, such as to get rid of a spell with flashback or that matters when it's in your opponent's graveyard
Havoc is a small price to pay for data