and if you have mobility skills like "Move and Gain HP," their descriptions include the fact that it disables the Undo Move
Grist, the Hunger Tide is a three-mana Black and Green planeswalker that can do a bit of self-mill and make Insect tokens, sacrifice creatures to destroy creatures or planeswalkers, or drain the life from your enemies based on the number of creatures in your graveyard
Most of the alternatives on this list offer better general or better specific card quality and so you really need to know what it is you are trying to do with this kind of spell so as to play the most effective in your deck
Hypnotic Specter Hypnotic Specter used to be a nasty black creature, but both threats and removal have become more efficient in our modern era of Magic, pushing this specter to the side
BPhillipYork: It's a decent enough artifact creature if you need that, or need a robot, but skulk doesn't work that well with a massive +X/+0
The most important card from this build is Retreat to Coralhelm