Slimefoots low cost means you can cast him from the command zone with ease, and his passive ability, (note the crucial wording of each opponent) combined with a board full of Saprolings and a good sacrifice outlet, has the potential to wipe out an entire Commander pod in one stroke
[6] Shadowmoor merrows' skin is made up of tiny diamond-shaped scales topped with even smaller barbs, which can catch and rip delicate flesh
This type of deck almost builds itself, letting you lean into tons of sacrifice effects to get an army of Insects
Honorable Mentions The Odyssey Eggs The original Odyssey Eggs dont fit my description of giving you a card back, although they fit colorless mana into specific colored mana like the signets
Savage Beating is far from a Constructed all-star and is mostly reserved for casual Commander play
Space Marine Scout can, and it also has First Strike and Vigilance, two smashing keywords for a utility creature