The Basement, the Endless Junk

Cardboard Box - {t}: Exile target creature with
power 3 or less for 2 turns.
Gundam - {t}, {2}: Create a 2/2 Artifact creature
token
Computer - {t}: 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.