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The Phyrexian horror has an Oil Slick version, along with a Step and Compleat foil treatment

The minus ability leaves a bit to be desired, since it will often fail to kill a big creature, but it does have the potential to kill indestructible creatures like Hazoret the Fervent, and it can at least finish something off after a block

For this Bone Dragon, it has a special ability that you can pay mana to use while the card is in your graveyard

When you successfully attack a battle it will take damage just like a planeswalker, and you can also target and damage battles with things like Lightning Bolt that specify "any target" also, just like planeswalkers