Hitting for an additional 30 damage allows Mega Lucario ex to scale its Mega Brave attack from 270 damage to 300 damage, and it looks like you can play multiple copies to increase your damage from +30 to +60, etc
It just had a lot going for it super rare cards, fantastic new mechanics, and an archetype that to this day is being played in the Pokemon TCG
Yidris, Maelstrom Wielder plays into the archetype wonderfully because the spells you cascade into are also cast, which ticks up the storm count and makes your finishers that much scarier
Lorcana should make pretty great Disney gifts when they launch, and good gifts for gamers if the person in question loves the House of Mouse
Are you excited to collect and/or play with them
Following an attack, the player draws one card for each equipped attacking creature