Although there are situation where a 6 loyalty walker is just dead and your pair of rats would live the Nahiri is a much better deal and a much more powerful package
Pokemon has a plethora of introductory products that were created with new players, young and old, in mind and my recommendation is the Pokemon Battle Academy
The last at #6 below is from a block often nicknamed as "The Artifact Block" by players, although it actually had an enchantment theme
If your Extremely Slow Zombie faces an opponent's creature with no strike abilities, the opponent's creature will deal combat damage first (when most creatures deal combat damage)
To go with the Egg Hammer, the set comes with an Egg Pawn (Myr) Token
though this has been achieved with numerous card games in the past, and is a feature present in several Living Card Games (or LCGs