Bad interactions

Ryudhyn

I noticed as playing Liliana, I used the middle planeswalker ability (deal 3 to all enemies) while my opponent had two creatures -- their first was affected by a Sigil of Valor giving it +2.

My ability killed a 1/1, and brought the "Valored" creature from 4/4 to 4/1. Then, because a creature died, the Sigil reactivated, saw the creature with 1 toughness, and brought it up to 4 health again.

I find it quite annoying that when a support leaves, it doesn't take the toughness it added with it.