Maze Rusher

Most haste-granting bodies point at a creature type or a single color. Tying the static grant to "multicolored" instead binds it to a deckbuilding identity, asking your board to commit to gold before the anthem does any work at all. The grant is continuous, not a one-time trigger: it applies to whichever multicolored creatures you control, so a steady stream of gold bombs cast after this resolves all arrive ready to attack. The wrinkle is that haste only matters on creatures that entered the turn they want to swing; the multicolored permanents already parked on your side gain nothing, so the payoff lives in the gold spells cast later, each landing combat-ready. As for the 6/3 itself, it comes down attacking the turn it shows up, which is the saving grace when the static ability has nothing else to grant; but casting a six-drop usually empties your mana, so the anthem reads as a promise about next turn's gold rather than an immediate board swing. Outside a guild-soup shell stuffed with multicolored permanents, this is a fragile beater with a dead second line: 6 power that swings once and folds to nearly any removal. Inside one, it converts every subsequent gold creature into a hasty threat, which is a different card entirely.