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With an effect that says it can give the ally life.
For most allies, this amounts to: no healing possible.
The ones that can (re)gain life are clearly marked by their
card text.
Some, like Renegade Garou, Black Spiral Buddy, and Hell Hound,
heal (regenerate) one life during their controller's untap.
Others, like Gargoyle Slave and Succubus, can take actions to
gain life. In the case of Succubus, this can even result in
having more life than the ally started with.
Some, like Talaq the Immortal and Shadow Court Satyr, can play
certain cards normally usable only by vampires. If the card
would gain the ally blood, the ally gains life instead.
--
L. Scott Johnson (vte...@wizards.com)
Official VtES Net.Rep for Wizards of the Coast.
(*) - Subject to review by Rules Team