Melissa, Master Armorer

Equipment spells you cast cost {1} less to cast. This effect
can't reduce the mana in that cost to less than one mana.

Equip abilities you activate cost {1} less to activate. This
effect can't reduce the mana in that cost to less than one
mana.

{x}{w},{t}: Search your library for an equipment card with
mana value equal to X, put it onto the battlefield, then
shuffle. Activate only as a sorcery.