Bosphoramus, Friendly Incubat

{3}{u/b}{u/b} -Gain control of target creature. At the beginning of your endstep, roll a d20
1-5: Return target creature, sacrifice Bosphoramus, Friendly Incubat
6-15: Return target creature.
16-18: Keep target creature.
19-20: Keep target creature, all creatures under your control gain indestructible and lifelink until the end of your next turn.