It should come as no surprise that leading the pack is Nadu, Winged Wisdom
Dream Trawler I tend to over-like Blue fatties
These are zombie staples, and some of them happen to be stapled zombies
P/T Set Number 119 Language Franais Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Timeless, Vintage Not Legal Formats Alchemy, Pauper, Standard Rulings (10/4/2019) Alela's last ability resolves before the spell that caused it to trigger
In the case of the former, its because the best choices vary not only by color identity, but often by specific deck building limitations: Seismic Assault and many other red effects want you to play an extra-high land count, while a black deck with reanimation and Tortured Existence obviously cares about discarding creatures