There are better heroic and non-heroic targets to be pumping your spells into
Your opponent can still destroy the Sword itself with any number of artifact destruction abilities, but artifact removal is relatively rare and can be played around easily
Burdens are easier to bear when shared with friends, and when Scion of Calamity attacks, it brings two along for the ride
Decimator of the Provinces Wow, thats one ugly pig
Taeko, the Patient Avalanche This four-mana mono-Blue 4/5 Turtle Ninja ETBs tapped, and then when another dork you control leaves without dying, you can scry 1 and toss a +1/+1 counter here
That last one is important for the odd fetch spell, but also for other lands like the new verge lands