This is my very first post on this site, so yeah....Sorry if this idea has been posted before, or if I'm doing this incorrectly.
I'm thinking of a card called the Plant of Life (life).
Plant of Life (without upgrades):
cost: 3 life
stat: 1/2
ability: Creature that devours PoL It can sacrifice itself, and the target creature gets 1 poison removed from it. PoL can use the deja vu ability once for 1 water quanta. The copy will have the same ability, but the stats will remain 1/2. Hmm, a creature can only have one ability...It'll copy itself once each turn, draining 2 water quanta (each turn) in the process. Or, once it is sacrificed, it'll automatically generate a new one in its place. You can't creature spam this way, but it'll make things easier.
Plant of Life (with upgrades):
cost: 2 life
stat: 2/1
ability: The same as the version without upgrades, but the stats remain 2/1.
Healing Herb might be a better name for this...