This stops nothing there. Modern Horizons 3 has lived up to its promise as a Horizons set and pushed MTGs power level forward in several important areas
A few instant-speed spells later, wed have more life than we knew what to do with and a finger resting on the metaphorical destroy target player button
I think it's far more accurate to say that Magic is a litmus test for poker
Here we have a set that is incredible in terms of card selection, artwork and new cards, but its not one that anyone should recommend because the cost of it is so incredibly high
If you need a bit more of a push to maximize your convoke triggers, you can play the Invasion of Segovia, which, when it flips to Caetus, Sea Tyrant of Segovia (a very impressive name for a 3/3 creature), it gives all your noncreature spells convoke, letting you bust out some combat tricks when you're normally tapped out
So you not only have to either cast, or hope for an opponent to cast, multiple spells in the turn, you also have to have five mana available to cast Spellslinger, plus whatever it costs to cast another spell, which is hopefully a really good one