Doubling the mana produced by your islands enables some incredible turns, especially with effects like Turnabout and Time Spiral
Even though it has since been reprinted in Commander Legends, the original white-bordered P3K version remains the ultimate flex
If you have Zada and four other creatures, casting Expedite means you copy it four times, giving them all haste and drawing five cards
For Gruul mana-fixing, I recommend prioritizing dual lands that count as both Forests and Mountains: Cinder Glade, Stomping Ground, Sheltered Thicket, and Taiga (if you're willing to spend lots of money) add layers of extra synergy to the deck because they can be fetched by lands (Wooded Foothills) and spells (Wood Elves) while also empowering cards that care about land types like Valakut, the Molten Pinnacle and Howl of the Night Pack
Flawless Maneuver wont save your creature from Deadly Rollick, which does the thing that needs to be done to many creatures in the format exile them
Read More: MTG Secret Lair Manager Teases Big Changes in the Future