All of these cards were ways to use excess lands that the deck found later in the game, either by discarding Sheltered Thicket itself or providing a way to convert lands into fresh cards, and Nahiri allowed her controller to discard Forest #100 to try to dig for some action
Mega-Evolved Pokmon cards have more HP and more powerful attacks than ordinary Pokmon-ex
For example, if you are unable to develop a Stoutland but want to Paralyze your opponent, you will want to evolve an Active Pikachu if available
One of these are the class enchantments, which are a very flavorful way to bring the feeling of building up your own D&D character to your deck
Creatures you control get +1/+0 and gain indestructible and haste until end of turn
Cards like Elven Ambush double your creature count, while Lys Alana Huntmaster makes your Elf creature spells a two-for-one, giving you an Elf token every time you cast an Elf card