Here are a list of the other life gain cards that see a decent amount of cube play that didn't quite make the top ten
Now, this appears to be reaching a fever pitch, as prices are up significantly, although they were low to begin with
2010-06-15 If an activated ability of a creature you control costs no generic mana to activate (for example, if it costs , it costs , or it costs only nonmana actions such as or Sacrifice a creature), Training Grounds simply wont affect it
Theyre similar to enchantments in that theyre permanents that stay on the battlefield once they resolve , but they tend to have a different flavor and purpose than enchantments
I can see this white creature being the top-end of a white-weenie style Cube deck that focuses on low-curve creatures
You then get to have that player discard a card at random