Path to Exile is the optimal removal for the deck (especially since we can sometimes eliminate the downside of giving our opponent a land with Leonin Arbiter), but Declaration in Stone is a fine budget replacement with some upside against token decks since it exiles all copies of a creature
Loxi: As far as three-cost counterspells go, I quite like this one
If the target is legal but not destroyed (most likely because it has indestructible), its controller does lose 2 life
Commander Qty: 1 Price: $1.29 Grist, the Hunger Tide As long as Grist isn't on the battlefield, it's a 1/1 Insect creature in addition to its other types
Ulvenwald Bear Ulvenwald Bear can enter with two +1/+1 counters, or you could give it four with the ones from Ayula, Queen Among Bears trigger
Dracogenesis (0300 Showcase) - $29.94 Dracogenesis is one of the main cards that has been generating buzz, and the buzz is well-warranted