There are a large number of gold cards with red in them in Amonkhet , but only Samut, Voice of Dissent really feels like it can be the focus of a truly red-centric deck
Bramble Familiar Bramble Familiar is a fine ramp piece that offers some self-mill and the promise of a random permanent once mana's no longer an issue

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Woodweaver's Puzzleknot: 5 mana to get 6 Energy counters and gain 6 life
Not only is this the most dangerous card of the ones offered here this is one I would want as a cycle as well, every colour needs one of these
Regardless, I expect the Old School spikes will eventually surge all these above $10, too