An opening of Great Furnace and Petal + two Tomb Raiders seems pretty brutal
Because it drains the life of every opponent as a free upkeep trigger, and converts that to scrying, you're always using it to set up your card draw
The boxes turning up to LGS in North America now seem to be from this re stock
You can remedy this with indestructible noncreature permanents like Darksteel Citadel, which you can continuously target as many times as you like
Anyhow, because Oakhame Adversary has deathtouch, even 1 damage is lethal
Rendmaw also incentivizes you to build decks in a different way, and adding cards with two or more types helps you to build around artifacts, enchantments, or mechanics like delirium