And in addition to all that lovely synergy, Kumena's effects scale really well, drawing cards when the board is small, adding +1/+1 counters to a team that's wide, and growing more and more powerful as you play late game cards like Seedborn MuseSeedborn Muse
When those cards are anywhere else (in your hand, your deck, your discard pile, or as your Prize cards), each card is treated as one separate card
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One can argue Liliana, the Last Hope is a good example of how to do it if you want to do it, having card advantage both on her plus (in the form of removal) and minus (see also, domri rade), but both being restricted in what they can target or when they can be activated safely, while Teferi, Time Raveler is a bad example, having a minus thats unconditional card draw AND half a removal, and the right choice to pick in 95% of situations