What common spell beats it, and what is that technicality
Mechanically, a traditional "split" card, like this one (which was played by Pro Tour Champion Kai Budde in the greatest Pro Tour Top 8 of all time) is practically / thematically very similar to both cycling cards like Go for Blood and many Modal Double-Faced Cards
I briefly experimented with Birthing Pod in affinity but I created something unholy
Once you do complete the Undercity, Rilsa gives one of your creature's a massive buff that makes it rewarding whether it is blocked or not in terms of killing creatures or dealing massive damage
The above image from easchner confirms that Fatal Push is an option
That is obviously not correct, and yeah, I eventually got it, but at first sight, it was a bit confusing