You have the Quirk All for One, though not quite at the same level as the man himself. You start out with ten Quirks aside from itself, which you may choose freely save for One for All, though Rewind, Overhaul, and New Order, due to their sheer power and versatility, are worth two, three, and five other Quirks, respectively. With just normal human physiology alone and no training, you can use about a dozen quirks or other stolen abilities at once, which scales upwards as either of the two factors is enhanced.
Be mindful of sharing too much of your collection with a single person, because the strain of so many abilities on their body might just break them if they're too weak.