Rowan makes cards that are already extremely strong such as Ad Nauseam and Bolas's Citadel EVEN STRONGER by making each drop of blood you pour into them discount your eventual game-winning spells, or even value pieces or tutors you might play along the way to secure your winning lines
I am also partial to getting a pseudo Time Walk out of it when my opponent has nothing going on and I give them a dud draw
Fast forward to 2009, and the first one sold for over $10,000
Gaining Hexproof is also super-relevant, as it turns off direct damage effects, discard effects, and a lot of graveyard hate all in one swoop
From calculating damage during battles to counting energy cards, your child will be using their math skills without even realizing it
1st Edition cards were only released in the first print run of the Pokmon TCGs Base Set before being replaced by Shadowless and Unlimited variants, so they are extremely rare