Mary, the Holy

First strike, vigilance, haste
When Mary, the Holy attacks, if you control
three or more artifacts, creatures you control
gains menace until end of turn.
Sacrifice Mary, the Holy at the end of turn
if you attacked with it, then investigate.
{4}{u}: Create two clue artifact tokens
{2}{u/r}{u/r}{u/r}: Return Mary, the Holy from your graveyard to the battlefield