Flash is very important as against target removal, it acts like a counterspell
Bloodthirsty Conqueror, however, serves as both a potent combo piece and a powerful standalone threat, making it much easier to integrate this life-drain combo into a competitive deck
These tokens grow in power and toughness for every artifact you control, creating an exponential growth curve that can turn a small utility board into a lethal force within a few turns
And among the cards you could draw into is a powerful enchantment from the older Dragons of Tarkir set, Assault Formation
Mishra's Workshop created effects that in modern terms were even more obscene, letting you drop cards that cost six mana on turn two without spending any cards
The card is sweet but easily dealt with so I didn't want to put a full playset, but it is has enough upside to where I'd throw a few copies in