Reverse Bear Trap

{3}: Equip to any creature in play, then pick a
number between 1-40 then once for the next
5 turns, they roll 2 D20s, if they roll the
number you choose, the Reverse Bear Trap is taken
off and goes to the graveyard, if not,
creature dies and goes to your graveyard,
you may pay {b} and roll a D20
1-18 It fails, you may pay {b} again for another
attempt until your out of mana or you are successful.
19-20 Return Reverse Bear trap to your hand but cannot be played again for anot