Wild Die Advantaged/Disadvantaged

Design Notes: This a new concept inspired by some of new mechanics like ind D&D 5e and CoC 7e, where the GM tells the players they have advantage or disadvantage based on the situation.

CONCEPT 1

Advantage: Wild Die is a d8

Disadvantage: Wild Die is a d4

I am not sure how much of a advantage this is because they have a 1 in 8 chance of exploding in the former and 1 in 4 chance in the latter.

CONCEPT 2

Advantage: Wild Die Explodes on a 5 and 6

Disadvantage: Wild Die does not explode

CONCEPT 3

Advantage: Wild Die -dX

Disadvantage: Wild Die +dX

dX can be a d4, d8, d10, d12 depending on the situation.  These dice do explode as well.