Shardless Agent (Retro) [Modern Horizons 2]

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)

“The left blade is a for a swift, painless death. The right blade for a long, lingering one. The choice is mine.”