Six mana for a 5/5 was a decent rate for the era, and protection from white was extremely relevant
After the creature you targeted died, you will get the Capsule back from your graveyard
So if your Phantom Train managed to dodge a suplex and you're going in for the kill, just peek around and make sure the opponent doesn't have a Phoenix Down sitting in play.
Black decks can find ways to drain the life out of opponents while keeping you healthy
This is a pretty extensive list of cards, but there are plenty more out there
Johto has a ton to pull from for a set, including the introduction of baby Pokemon, and with so many classic Pokemon from the region still yet to see appear in any set, there are plenty of options for some fantastic cards