Talisman of Creativity is premium two-color fixing and ramp, and the reason it sits so high on EDHREC is simple: it's a turn-2 mana rock that accelerates you into your commander a turn early while smoothing your colors.
The colorless mode is genuinely relevant—you can tap it pain-free for generic costs, paying the 1 damage only when you actually need or . In a 40-life Commander game, that life is trivial.
Who wants it: Any Izzet (UR) deck, plus any multicolor deck that includes both colors—spellslinger, artifacts, "draw-go" control, Niv-Mizzet builds, or fast combo decks that value cheap acceleration. Talismans beat Signets in decks that want untapped, colorless-flexible mana.
When not to play it: Mono-color decks (a Signet or basic ramp like Mind Stone is better) and slow, grindy battlecruiser pods where the early acceleration matters less than card advantage. Otherwise, in any two-color-plus UR deck, this is a near-automatic include.