Obliterator's Ace

Bestow: {u}{b}{b}{b}{p/u}
At the start of enchanted creature's owner's upkeep, they discard X cards and gain X life where X is the amount of Obliteration counters on lands that player controls.
Obliterator's Ace's Power and Toughness are equal to your life total divided by 3, rounded down, and then doubled rounded up.