Originally Posted by
lordofthepit
This card seems terrible against Miracles. This is just another creature that can get hit by Swords to Plowshares or their many sweepers (Terminus and Engineered Explosives), or run into Counterbalance lock in late game. If you want to use the "Grim Lavamancer" ability, your opponent can fizzle you by responding with a Snapcaster Mage and then casting the targeted spell. Unlike Scavenging Ooze, this card requires you to tap to activate, so you can't re-activate right over the top of them.
This card seems too small to affect the board, too conditional for the life gain or life loss effects to be worthwhile, and too insignificant as a piece of gravehate. The ramp ability would be very nice, but again, it's dependent on lands being available in the graveyard (and I believe this is not a mana ability since it targets something, meaning your opponent can "fizzle" the mana production with an Ooze).
IMO, it might see some play in Rock (think Ulvenwald Tracker), but I highly doubt it will be a staple anywhere.