Kyodai was always a less optimal choice, not really synergising with Scion, and seemed out of theme as a dragon that had no place in Skyrim (take a look at the art... the body is made out of human limbs... ew....). Karrthus, on the other hand, is much more in keeping with the aesthetic, and adds a valuable ability to give all my Dragons haste that works with the mass reanimation spells (and a side ability to regrab my dragons if someone steals them, or really screw up
the Ur-Dragon deck that is also in my playgroup!).
Revision 24Added/removed cards:
-1
Kyodai, Soul of Kamigawa+1
Karrthus, Tyrant of Jund