So lets rank these cards for your benefit
There is an equal chance to packing the other three (Haunter, Onix, and Jigglypuff) with a 23.84% probability
Black Market Connections Black Market Connections is such a nice way to convert life into resources every turn, and with typal decks you can get a 3/2 changeling creature every turn

Benefactors Draught Untap all creatures Until end of turn, whenever a creature an opponent controls blocks, draw a card Draw a card Momentous Fall As an additional cost to cast this spell, sacrifice a creature You draw cards equal to the sacrificed creatures power, then you gain life equal to its toughness Return of the Wildspeaker Choose one Draw cards equal to the greatest power among non-Human creatures you control Non-Human creatures you control get +3/+3 until end of turn Veil of Summer Draw a card if an opponent has cast a blue or black spell this turn Spells you control cant be countered this turn You and permanents you control gain hexproof from blue and from black until end of turn Budget In regards to budget green card draw spells at instant speed, there are tons of cards that cost 2 mana that will give a creature some sort of boost while also drawing you a card
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I just wish that, in a vacuum, the Final Fantasy Commander decks had a more comprehensive and consistent mana base overall