The fact that it has flying, haste, and hexproof the turn it enters means it almost always gets to attack safely at least once
With Urzas Saga and Stoneforge Mystic the deck also has multiple ways to tutor for their namesake card, making it a highly synergistic and consistent deck
The deck rarely explodes early but steadily overwhelms opponents through repetition, resource efficiency, and long-term board control
Karn, the Great Creator [Best Artifact Control and Combo Enabler] Karns reputation really comes from that static ability while doing heavy lifting before you even touch his loyalty
If the spell has any mandatory additional costs, those must be paid to cast the spell
Some of these cards hit hard, and I suspect Limited game play will be a lot of fun