Double targeting is currently not allowed.
Well, there you go.
Thematically, I would suggest this:
: Target a creature. Rob it of one attack or one defense.
The ATK/DEF would be chosen by which is higher on the targeted creature. You gain one of that stat.
I would also suggest that you lower the attack to 0 | 1 starting out, but keep the defense level. This makes it more balanced.
If anyone argues OP, either raise the ability cost to
or lower the defense by one.
AFTERTHOUGHT:
for the ability: can you show your reasoning/arguments?
Nice avatar as well.