If they rely On Play effect to KO your Characters, then it can put them in an awkward situation
If an attacking or blocking creature somehow becomes a battle in addition to being a creature, it is removed from combat.
The most significant aspect of the card is that its trivial to splash Heartflame Splash in an otherwise mono-white deck, giving you access to reach that is typically one of the weaknesses of white as an aggressive color
While many in the counterfeit card community disavow selling fake cards to players, the fact remains that simply by handing your money over to counterfeiters, you are helping to improve counterfeit cards, make them more realistic, and assist other people in scamming other players
Does that reflect that to the cards itself
If this causes the number of historic cards in your graveyard to change (probably because you are casting The Capitoline Triad from your graveyard), that new number will be used to determine the cost reduction