The Basement, the Endless Junk

Cardboard Box - {t}, {2}: Exile target creature with
power 3 or less for 2 turns.
Gundam - {t}, {2}: Create a 2/2 Artifact creature
token
Computer - {t}, {3}: Create a Computer artifact
token with "{t}, sacrifice this artifact: Exile the top
card of your library until your next turn. You may
cast that card and that card costs {2} less to cast"