Mizzium Apparatus

Whenever you discard an instant spell, exile that
card from your graveyard.
{1}{u/r}{u/r}, {t}: draw a card, then discard a card.
Equipped creature has "{t}: you may cast a spell
exiled with an equipment named Mizzium
Apparatus attached to this creature without
paying its mana cost. Then exile it."
Equip {2}