Munehisa Iwai, The Hanged

Menace
Whenever an opponent casts a spell, that player
may pay {2}. If the player doesn't, you create a
colorless Treasure artifact token with "{t},
Sacrifice this artifact: Add one mana of any color."
{3}{u}, {t}, Sacrifice a Treasure: Search your
library for an Equipment card, reveal it, put it
into your hand, then shuffle your library.