This godly knife came from the Easter Event 2023: you could buy it on its own via the Rainbow Gamepass or in the Rainbow Bundle, and both are now offsale. So trading is the only way to get one. It's part of the rainbow set alongside the Rainbow Gun, and the bright rainbow finish is the main draw for collectors. Sits near Flora and Bloom in value.
Rainbow (2023) is a Godly knife in Murder Mystery 2. Its combined value is 400, #23 of 146 godly items and #97 of 921 valued items overall. Demand is fair: you will find a buyer, just not instantly.
Closest in value: Flora (403), Bloom (395), Rainbow Gun (408). Use them as a benchmark for a fair one-for-one trade.
Value history
What it is worth in other items
1 : 1Flora
1×Bloom
1 : 1Rainbow Gun
1 : 1.1Xenoknife
1 : 1.1Xenoshot
1.2×Heart Wand
1 : 1.6Elf (2019)
1.6×Bats (2018)How many of each item equal one Rainbow (2023) by value. Demand differs between items, so check it before you trade.