Hmm Slash Charger is good against decks that rely on specific finishers and certain key cards, but other than that its main effect is just being mana accel. It has a place in mill decks, but do you really feel like you need Slash Charger in a RUB deck? The problem in RUB is that all the other cards you use there are top of the game cards with high impact values and little risk. Slash Charger has zero impact on the board, and basicly just takes you 1 mana ahead. I would personally say no to your question, but maybe you have certain people in your meta playing a deck that is weak to Slash Charger? For example if somebody is playing a deck with a key finisher and only has a copy or two of it, then Slash Charger would be a nice way to counter them, as you could remove their chance of playing that card. But against any deck that runs 3-4 copies of all the important cards, removing one of them from the deck rather than impacting the board just doesnt really do very much for you. Much better off playing other better 3 drops on turn 3. So my conclusion would be that Slash Charger only has a place in Mill decks and decks where you desperately need mana accel (assuming you dont play nature). Volcano Charger and possibly Vine Charger are the only chargers i would ever consider using in regular decks.