User blog comment:Hollowblade/Trundle Buff: Break the Cycle!/@comment-4080931-20120404050249

Nah, Trundle requires no buffs. Magic Damage on his Pillar and Contaminate is a bad idea. To elaborate, Pillar's main use is to slow the opponent, while providing impassable terrain that allows your allies to catch up. So Magic Damage doesn't really fit on this ability. A Trundle player may also be conflicted between using Pillar to slow an enemy or using Pillar to damage an enemy who is attacking him, which is a bad thing in this case.

Contaminate doesn't require Magic Damage, because it already provides many steroids for Trundle, encouraging his team to keep the fight inside that circle. Since it has such a high radius, the magic damage would be completely unavoidable for enemy champions, making it a rather unfair/annoying ability. Karthus's ultimate may be unavoidable in most cases, but it has a channeling time and is an ultimate, so it can afford this luxury.