Urza, Chief Artificer Most of the time, youll be casting Urza, Chief Artificer just for 3 mana, thanks to its affinity ability, and while giving menace to other artifact creatures is nice, Id have loved for its final ability to be triggered on ETB rather than at your end step so you can blink it and endlessly create an army
Play Lion Heart with him in play, and you get not only a gunblade, but a twincast Shock
Sure, there are more like Scourge of the Throne but theyre a little niche, and far less reliable
Thats not until the end of the turn, or until the spell gets exiled from your graveyard or something
There are plenty of counters decks that will make good use of this
You want to control the board by eliminating every card your opponent plays, and Dragon Fire allows you to get rid of a high-value target that would otherwise be difficult to Challenge down