It is sort of evergreen in that you should expect to see it in new multiplayer sets, but not to the degree of keywords like trample or vigilance
Considering how poorly these World Championships Decks sold, especially in their later years, the print run of these must be tiny compared to full-blown premier sets
Probably the most competitive examples would be similar to the infinite life Kitchen Finks combo, which currently uses Anafenza, Kin-Tree Spirit or Melira, Sylvok Outcast
One semi-useful modal ability Deep Freeze has is that there are a few cards in Arcades, the StrategistArcades, the Strategist decks like Hornet NestHornet Nest and Wall of KelpWall of Kelp that make defender tokens, and in a pinch you could technically use Deep Freeze on them if Arcades is out to deal a little extra damage
The highlight of this drop, which sure enough contains some of the aforementioned buff spells, is an Ozolith reprint
A few cards have started to pop their head up in eternal formats, but the true winners here are those of us who get giddy at seeing fun and interesting casual cards