Some examples: Swords to Plowshares, Teferis Protection, Chaos Warp, Great Train Heist (or other Spree cards, you pay extra costs but can go wild), Akromas Will, Deflecting Swat, Wear/Tear, and my personal favorite, Reprieve
New players can pick them up quickly, while experienced players can tune them for higher power levels
I think that its a bit too expensive for what it does, but its definitely a cool design
If youre worried about build time (which is usually about 50 minutes), you can mitigate time anxieties by having a baseline done early (i.e., I know Im playing UB because I have Edgar, Sephiroth, Odin, and Ultimecia, Time Sorceress, but should I splash red for anything?)
Many people, myself included, have gotten a 5-0 trophy with something very similar to the following strategy
In order to make today's cut, you need to be just Black and then draw