mtg split card Up - Prerelease Cards copy the spell New Split second card for

If multiple Mountains you control enter at the same time, Valakut's second ability could trigger that many times

humans are well-supported, giving you access to tools like Coppercoat Vanguard and Laid to Rest

The same Fandom wiki article covers a handful of the missing cards that might have appeared framed as above (though there are many more hiding in plain sight that I cant talk about)

Were already brewing combos with this as your general and stuff like Perilous Forays and Earthcraft and Amulet of Vigor are insane

Finding these cards is great, but it wont happen all the time

Antiquities was set around an artifact concept even though all five colors were also used