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The key aspect of life gain for the cube is primarily the usefulness of the card that the life gain is attached to

You can only use each effect of "Rescue-ACE Fire Attacker" once per turn

However, this seems to be an acceptable, benign, limited use case of the technology

The backstory goes that in 1997 and 1998, one of Japans longest running comics CoroCoro ran competitions to encourage readers to design their own Pokemon cards

Because it's one of the most heavily pushed inclusions in the token theme in Bloomburrow , it's also one of the strongest, offering a slew of effects that scale up with the number of tokens available