Counter some spell or tutor for the missing piece of the puzzle.
Spot removal to take care of most creatures.
Late game control guy that can save pieces from destruction or lock down the board. Perfect fit for the deck for exiling any nonland permanent on the board. Included some Spreading Seas to play with as both card draw and mana fixing while dealing with enemy lands. His most ridiculous play: bouncing Leonin Relic-Warder in response to enemy removal with a Detention Sphere in exile, have the sphere target whatever form of o-ring you have the most of, replay the cat targeting d-sphere on the next turn, release a bunch of o-rings, then before those exile effects resolve, bounce the cat again exiling a ton of enemy permanents for no loss in card advantage.
A decent flyer. Really beneficial flicker ability. Flash in to start chain reactions and win out of nowhere.
While being a niche subcombo, it is also a valuable utility creature that can become the biggest threat on the board right before you exile their copy.
Much more than just a combo enabler, when facing burn or jund, she is the first line of defense. Her life gain ability triggers for any creature your opponents cast as well. I added some
Glamerdye
in the side so she can keep fulfilling that role even against rainbow decks.
Plan B for beater. When all else fails just smack them in the face. Vigilance on a manland is awesome as it can just tap itself to cast protection spells.
The mill rock to mill them all. You can win games with this and never land the combo, just locking down the opposing board and replaying
Oboro, Palace in the Clouds
.