Ariel, Thief of Fortunes

{t}, tap X other untapped rogues you control,
pick one:
- Subtract X+2 from target die roll
- Target opponent that just looked at the top of
or put a card on top of a library mills X+2 cards
- Gain control of X+2 target artifact tokens
- Gain control of target noncreature, nonland permanent with mana value X+2 or less.