Discard was quickly thrown out and replaced with direct damage, mainly to keep purple from playing like a traditional blue-black control deck (ironically, this made it play somewhat like blue-red, the two colors that mix to create purple, but this was a coincidence)
Stomp only stops damage from being prevented by effects that specifically use the word "prevent." Protection prevents damage, so protection will be unable to prevent damage after Stomp has resolved
This Pokmon relies on your discard pile to get the most out of its Assemble Alloy ability, attaching 2 Metal Energy from your discard pile to your Metal Pokmon in any way you like
Enchantments can have static effects, triggered abilities, or even activated abilities, while sorceries simply do what they say on the card, like Strangle deals 3 damage to target creature or planeswalker, and then go to the graveyard
Put a creature card from among them onto the battlefield with three +1/+1 counters on it