Arcane Parallel

Hidden Realm (Each endstep, a creature you
control can enter or leave this card's hidden realm.
While it is in the hidden realm, it is treated as though
it doesn't exist. It doesn't leave the battlefield)
Whenever a creature leaves the hidden realm,
you may draw a card then discard a card. Instants
and sorceries you cast during your next turn cost
{1} less to cast.
"I ventured into a world full of sentient spells, casting
mortal beings that dissipated after seconds."
-Jonah, the Mad