great western trail card sleeves Holds sleeved or unsleeved cards. Great Western Trail 2nd Edition

Honorable Mentions Not every Base Set holo can make the top ten, but calling any of these "cheap" undersells what they are

Adalbert Steiner gets +1/+1 for each Equipment you control

destroy as many monsters your opponent controls with lower ATK as possible, then you can discard your entire hand, and if you do, inflict damage to your opponent equal to the destroyed monsters total original ATK, also the targeted monster cannot attack this turn

Resource management is a key element of Magic: The Gathering, as anyone who's ever had too few (or too many) lands in hand will tell you

A powerful card that works in the deck but not for the deck if that makes sense