Odds are you'll be trying to meld it with Gisela, the Broken Blade to produce a game-winning threat, but you might lean into human and angel synergies to maximize the cast trigger
Everyone loves a cool backstory, especially one that reinforces an in-group
Alliances was a pretty revolutionary set, and Thawing Glaciers was an important part of that revolution
This time round you need to collect three cards of Two Rainbow Star cards
(This is the same reason I've stopped playing Phyrexian Arena in Standardit's just too risky with Sheoldred being so heavily played.) In Modern, the card could be a Seismic Assault replacement and does have the huge, huge upside of only requiring one red mana (although it does cost one more mana overall), but is it going to be fast enough
While a lot of people will argue that one point of damage doesn't mean much, in decks that make good use of tempo that one point could mean the difference between a win or a loss