Cards with prowess, or cards that provide +1/+1 counters whenever you cast an instant or sorcery are perfect fits within a spells matter Wizard shell
Youll run into: Tokens (usually standard size, but occasionally printed in other sizes depending on product) Emblems and checklist/helper cards (standard size) Oversized cards (promos, special products, Planechase planes, Archenemy schemes, Vanguard, and other delightful chaos)
Previously, these were silly types reserved for creatures in Un-sets, but now theyll be part of mainline Magic, where their sweeping definitions may introduce some flavor problems
This is Gollum, Patient Plotter Does anyone else think that having four versions of some characters is a bit much
Or decided to discard one or two via looting effects
Think the Reserve List might have something to do with that