After the beginning phases containing the additional upkeep steps, the game proceeds to the next phase as normal, which is likely to be your postcombat main phase (unless something has added even more phases
People play off-color Moxen in Vintage, after all, and Ancestral Recall and Time Walk are always worth splashing
To get them to exile the thing, youd either have to make it so that two life is high stakes, or put it on some mana dork
Once a ward ability of a permanent with a counter on it has triggered, causing that permanent to lose ward by removing Innkeeper's Talent or removing the counters from that permanent won't affect that ability
Black can wipe the board of creatures all day long, but not being able to remove other problematic permanents like enchantments or artifacts can be a real problem for the color
The Mages of Strixhaven Unearthed Arcana features Strixhavens five colleges as subclasses