The Reality Chip (Kamigawa: Neon Dynasty)

You may look at the top card of your library any time. As long as The Reality Chip is attached to a creature, you may play lands and cast spells from the top of your library. Reconfigure {2}{U} ({2}{U}: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)

NM - $5.50
LP - $4.50
MP - $3.50
HP - $2.50
DMG - $1.50