Drifter, Hyperlight

Double strike, flash, reach.
For each instant or sorcery in your graveyard: Drifter, Hyperlight cost {1} or one manna of its
color less to cast.
When Drifter, Hyperlight enters the battlefield
or attacks: you may cast an instant or sorcery
from your hand or graveyard with converted
mana cost less than or equal to Drifter,
Hyperlight's power without paying its mana cost.
If you were to cast it from the graveyard, discard
a card first.