Awesome looking card, but
When you say "convert 
into its cost", do you mean "pay for the creature with life quanta without summoning it", or change in your quanta pool to match the card's cost type?
Can this card summon ultra-rares, or cards normally unobtainable in normal play (singularity, foil-chimera, ash etc.)?
I like how this uses the same duo cost as fallen elf, possibly allowing for 
duos to become more viable, but this card still seems very niche, requiring decks to be entirely based around it to use it's full potential. Could you demonstrate it's potential uses in example decks? They don't have to be amazing I just want to see the ways you envisioned it could be used. I'm pretty much asking to be proven wrong
The mechanic will change
quanta in your pool into quanta that matches the selected creature's cost type, up to the amount listed on the creature... So... it could actually be used as a quanta converter, but you would risk clogging up your hand in doing so.
I picked this mechanic because altering the type of quanta used to pay a card's cost would likely require rewiring some of the internal flash code... at least from what I can gather from other card discussions in the past. This mechanic gets around that need and so should be much easier to implement.
I am envisioning this card to behave like SoSe in terms of what cards it will generate, but limited to only selecting creature cards.
I don't think a deck would need to be geared around this card specifically.
It could easily be splashed into just about any life deck that could accommodate an
mark.
The idea is to provide life with a steady stream of creatures.
While mitosis helps with this it (1) is prone to CC counters an (2) is somewhat limited in what creatures it provides.
This could be invaluable against CC heavy decks. It also gives
a second meaningful permanent, which will help take pressure off of empathic bonds. E.g. if you are fighting a
deck, they will have to choose between targetting this or an empathic bond. Both permanents are significant threats and they won't have enough copies to take out both. Moreover, if they rely on spells as their CC this card would eventually wear them down in the long run and could even provide you with creatures that could work as a counter.
Lastly, it is pleasantly resistant to steal since the opponent would need both a small
source and a strong
source to power it.
Some examples I can think of right away:
Add into mitosis + empathic bond deck. Power with pillars and entropy mark... or just forget mitosis and mix pillars and pendulums with this + bond.
Put into a fallen elf / druid deck, or other life / entropy duo powered with pendulums and a few novas / super novas to help power creature skills.
Put into a rainbow deck powered with chroma mark and life pendulums (should v1.4 ever become real this would be quite viable).
Pretty much any rainbow deck powered off of QP could have one of these splashed into it.
In the case of the upgraded version, you probably don't even need a super strong
source. If you use this with a more or less empty hand, you have 8 cards to choose from. As long as you have 1 to 3
in your pool, at least one of them should be viable. So even decks that use supernova or cremation could get some use out of it. Especially since there are more 0 cast cost creatures in the upped meta.
