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2 - Electro, Assaulting Battery Another mono Red option, Electro, Assaulting Battery could be ideal for spellslinger decks since it stores red mana, then adds red mana as you play instants and sorceries

Blink-haters beware--Riptide is going to be a problem

It also specializes in big creatures, which do not innately require Equipment

(2023-09-01) If a spell is cast as an Adventure, its controller exiles it instead of putting it into its owners graveyard as it resolves

Plenty of cards fit into this category, and these shouldn't steer you too far in any direction, so feel free to abandon them if you see better cards in a different color later