Only the mana cost, mana value, color, power, and toughness change depending on whether the card was cast as a prototyped spell
Kazuul's Fury is Fling for 1 more mana, one that can also double as a land in a pinch
Choose Your Avatar Swap Your Card Sleeves ADD A COMPANION Customize Your Emotes Choose Your Avatar Swap Your Card Sleeves ADD A COMPANION Customize Your Emotes It's your game
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
For example, 2/3 means the object has power 2 and toughness 3
Its like if stocks and shares made any sense and werent just fake money that somehow makes all of our lives expensive