Has super saiyan kaioken ever been animated in Dragon Ball Heroes? The Dragon Ball Heroes wikia claims Xeno Vegito can use the super saiyan kaioken technique and there is this picture of it, which I dont know where it comes from.

Super Saiyan Kaioken Dragon Ball wikia
Does it come from a card, or has super saiyan kaioken ever been animated in Dragon Ball Heroes?
Dragon Ball Heroes is an independent series with its own story arcs as well as original characters. It also uses both the plot and characters from both Dragon Ball Super and GT to fuel its storyline, but it does not affect either of the series. So therefor, no. This is proven at this Link.