Spellslinger decks dont run many creatures, but tossing away a stray Goblin Electromancer or something is feasible in the late game, especially if your Flare of Duplications resolution gives you a win
Repeat, blowing up all the noncreatures on the board (well, probably not your own)
While Charizard was an exclusive in the Lava deck, both the Dark Raichu and Dark Blastoise were exclusive to the Turmoil deck
Also more liable to get hit with disruption making it relatively unreliable
If Thancred Waters leaves the battlefield or you lose control of it before its triggered ability resolves, the target legendary permanent won't gain indestructible at all
While Amorphage Greed has its strengths, other cards like Amorphage Lechery and Amorphage Wrath offer similar effects with different restrictions, making them potentially better options depending on the specific strategy of the deck