I like the flavour of Rukh Egg here, where it's a 0/3 creature that, once destroyed, the egg hatches and a 4/4 flying Rukh comes into play
[48] [49] [18] Blue represents intellect, logic, manipulation, and trickery, and pulls its mana from islands
It is exciting to see it evolve during our time playing Magic
Further Upgrades The first cards I'd pick up to further juice up the deck would be untapped mana-fixing lands: Watery Grave, Shipwreck Marsh, Underground River, Morphic Pool, Darkslick Shores, Polluted Delta, Sunken Ruins, Undercity Sewers, Urborg, Tomb of Yawgmoth and then maybe a couple more Island / Swamp fetches
Considering your deck is set up to generate these each turn, these cards truly do create a ton of tokens
Or maybe it did, depending on your slant