The new tokens copy the characteristics of the original token as stated by the effect that created the original token
Kenrith's Transformation fills that spot well, but its also cheap and provides a highly playable green cantrip
Losing results in losing a portion of your DP
Ones with a rarity of one through four diamonds can be swapped for equivalent ones
Between those and the two blue shrines that draw cards you're pretty much set in terms of card drawing in the deck, but if you want more variety there's plenty of other enchantment options like Mystic Remora, Rhystic Study, Phyrexian Arena and so on
Finding the perfect land mix won't be easy, but I could imagine shaving a Plains, a Deserted Beach, or a Demolition Field to make room