After spending a lot of time to figure out exactly which cards would be leaving (again - way harder to do than it should be) and doing a lot of research on competitive Pauper events, here's the 25 cards you'd need on the "additions" list
Cards with first strike only apply combat damage in the first combat step, whereas a card with double strike applies damage in the first and second combat steps
In these attempts to find the most effective methods for pack pulls, players have come up with the theory that crumpled card packs have a better pull rate than pristine ones
Rather than directly countering a spell, these tax effects force opponents to spend extra mana, slowing down their curve and disrupting their strategy
Vortex offers much better evasion than Phoenix and is harder to stop even if it cannot be recurred
There may be a couple of terms you are unfamiliar with here, butthis reading assignment should elucidate the matter