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Toxic gives you an extra layer of flexibility, you can deal regular damage and add poison counters

It has many factors working for it

New black- and white-bordered cards are legal as of the Prerelease event for the corresponding set, or in the instance of supplemental products, like Commander decks on the release date

[-6]: Target creature gets +10/+10 and gains trample until end of turn

This discount setup is famous for enabling powerful infinite loops, with the classic example being Reiterate plus Electrodominance, and even without combos, it lets you pour very little mana into massive finishers like Crackle with Power

But taken as a whole, it can provide enough early advantage to snowball you into a quick win