On a budget, skip I amsterdam City Card — the spend outweighs the payoff.
~€60 (24h) to ~€110 (72h)
Genuinely good value if you're a museum-machine cramming several paid sights and lots of trams into 1–3 days — the maths works for the relentless. The catch: it pointedly excludes the two biggest draws (Rijksmuseum and Van Gogh are not included), and a relaxed traveller doing two sights a day will lose money.