Any "as [this creature] enters" or "[this creature] enters with" abilities of the chosen creature will also work
For the record, heres the collection of cards I ordered: Liliana Vess SDCC 2014 version Mana Crypt Special Guests (green) Lotus Petal Tempest (old border) Gaea's Cradle Gold-border World Champ version Fury Borderless Special Guests Krark's Other Thumb Silver-border Unstable card Uro, Titan of Nature's Wrath White-border Mystery Booster 2 version Swords to Plowshares Bloomburrow Special Guests Time Warp Mystical Archive Toxrill, the Corrosive Black-and-white Double Feature version
Winter, Misanthropic Guide Winter, Misanthropic Guide warps the game with a whopping two extra draws per turn
Blue was all about Merfolk, which have, of course, continued to receive regular support over the last three decades
You could take an approach that Chris (Commander Mechanic) did with Ziatora, the Incinerator, where you make 15-card packages to change the decks theme or sub themes on a whim
The catch here is that you have to be careful to not have it fizzle
