Silmaril

Indestructible, hexproof
{5} attach to target creature.
{5} detach from creature. Does not actually detach
until the beginning of players next untap step.
Grants Feanor +15/+15 if equipped.
Grants Finglofin +12/+12 if equipped.
Grants any other creature +10/+10 if equipped. However, that creature gets exiled at the
beginning of the players next untap step and the Silmaril cast back into the void (out of field).