A ready-made German deck you can actually make your own.
Anki makes you build the whole deck yourself. Duolingo serves you a fixed one. Wortschatz gives you a good deck out of the box — high-frequency words, ready the moment you sign in — and lets you reshape it: filter by level, type and theme, add what you hear, drop what you know.
The schedule runs on spaced repetition — decades of research on how memory actually works — and brings each word back right before you'd forget. Words arrive in frequency order, so you learn what you'll actually hear and read first.