In the Slimefoot decks this is great

Secret Lair x Fallout: Beyond Vault 33 Contents : 1x Lucy MacLean, Positively Armed New-to- Magic design 1x The Ghoul, Gunslinger New-to- Magic design 1x Maximus, Knight Apparent New-to- Magic design 1x Pre-War Formalwear 1x Spirit Mantle 1x T-45 Power Armor as "T-60 Power Armor" Price : Non-foil: $39.99 USD Foil: $49.99 USD Secret Lair x Fallout: Greet the Dog Contents : 1x Yoshimaru, Ever Faithful as "Dogmeat, Constant Companion" 1x Arcane Signet 1x Lightning Greaves 1x Patchwork Banner 1x Sol Ring Price : Non-foil: $29.99 USD Foil: $39.99 USD Secret Lair x Fallout: Rad Contents : 1x Ripples of Potential 1x Mutational Advantage 1x The Wise Mothman 1x Mindcrank 1x Mesmeric Orb as "Mothman Egg" Price : Non-foil: $29.99 USD Foil: $39.99 USD Secret Lair x Fallout: Welcome to New Vegas Contents : 1x Tinybones, Trinket Thief as "Benny, Platinum Thief" 1x Isshin, Two Heavens as One as "Joshua Graham, Burned Man" 1x The Deck of Many Things as "Custom Caravan Deck" 1x Caged Sun as "The Platinum Chip" 1x Nuka-Cola Vending Machine as "Sunset Sarsaparilla Machine" Price : Non-foil: $29.99 USD Foil: $39.99 USD

If a permanent spell is copied, new targets can't be chosen for it, if it has any (perhaps because it's an Aura or a mutating creature spell)
It not only jumpstarts your speed on turn 1, but it also grants haste to any creature just by tapping itself
You can kill the most threatening player in the pod without nuking your board