Tier 3 Veigar Ult doesn't 1 shot Yorick units
I just watched a 3-star Veigar fail to kill Yorick minions multiple times in a row while double-casting (or single casting) his ultimate.
I'm not sure what else to say about this, other than this behavior is odd. The units did have the first tier Mystic buff, but I don't think that should have been able to reduce the damage from a 3-cost Veigar ult.