Being able to protect your commander is invaluable, but you dont always want to play Lightning Greaves in decks where you might need to target your commander and you might not always need haste
Tap: Add X mana of any one color, where X is the number of soul counters on Seance Board
10 Vile Mutilator An Awful Way To Go Yes, seven mana is a lot to pay for a 6/5 flying trample, especially one that requires either an enchantment or creature sacrifice
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
Both of these creatures exile a land you control on entry, then bring it back once they leave
Klefki's attack is also useful, as it might only do 10 damage, but it also removes tools that are attached to the opponent's Pokmon