Grabiod/Elite Graboid costs 1
for it to gain +6/+8 and lose immortality. It can only be used once.
This costs 1
for it to gain +5/+6 and lose 5/6 health. It can be used twice, or more often if buffed.
I suggest rage/beserk costs 2
. For beserker, this would mean that for 4
+ 4
you get a 11/1 creature. For elite beserker, you pay 4
+ 4
for a 13/1 upgraded creature. This seems more balanced.