Imposing Grandeur This was originally #3 on my first take, as mentioned above, but I really do like it as a #2 as well
It is also one of very few that provides snow mana, which thanks to Kaldheim and Modern Horizons 2 has some serious upsides
In addition to its rather beefy combat stats, Kroxa and Kunoros lets you effectively escape a creature from your graveyard to the battlefield by exiling five other cards
The fact that Thought-Knot Seer might get trumped by Siege Rhino in combat is definitely a concern, but there are also things like Ghostfire Blade or the fact that, if youre on the play, Thought-Knot Seer can actually take their Siege Rhino
Harrows the classic, and it puts lands into play untapped but also folds hard to counterspells
It makes creatures, although its expensive, and it can transform into a powerful beater that can end games for a relatively paltry cost