Ultimecia, Time Sorceress / Ultimecia, Omnipotent The surveil on attack is an underrated reason to play Ultimecia, Time Sorceress but to fuel an extra turn thanks to Ultimecia, Omnipotent is never to be underestimated
Stolen by the Fae
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
Yes, I keep mentioning the Thumb because it's that important
This means you can intentionally dump your best creatures in the graveyard, then bring them back for a lower cost
Of course, they come with their downsides, like forcing you to sacrifice creatures or losing life