So, if Summon: Fenrir enters with two lore counters on it, both its first and second chapter abilities will trigger, and you can put those abilities on the stack in either order
Its only move requires three different types of energy cards, one each of water, fire, and electric and this move does do 90 hp which was quite a bit for these older cards but then you have to discard 3 energy cards after the attack one of each type required for the card and then you'll have to wait 3 turns again to use this move again unless you stockpiled energy onto this card before you attacked
Some cards will feature new Link Abilities
Creature die
for example, Mobilizer Mech and Peacewalker Colossus can both animate other Vehicles
Introduced as one of three crystal-type cards in Mysterious Mountains, alongside Crobat and Celebi, Crystal cards can change their energy type based on an attached energy card