I give this card an honorable mention because, unlike the other cards that are great from Ravnica Allegiance that aren't on this list, the structural advantage of taking advantage of a limited resource like "life" puts it on a different axis of analysis (the Philsophy of Fire) in a way that no other good card we might talk about can touch
Generation I starter with permanent legacy status One of the three Base Set starter holofoils that founded the modern TCG Mega Blastoise design from Gen VI is widely regarded as a strong Mega Evolution Iconic water-cannon design across the entire Blastoise line Cross-generational cultural recognition Generation I starter in Pokemon Red/Green/Blue (1996-1998) Multiple anime series including Gary Oak's signature Blastoise Pokemon Stadium / Stadium 2 prominent feature Mega Blastoise in Pokemon X/Y (2013) and OR/AS (2014) Pokemon GO release in 2016 with subsequent Mega Blastoise event Blastoise has been a stable Water-type pick across multiple generations
Also, they usually have high requirements, so not having any basic Pokmon can leave you stuck for a few turns
Crystal, Inhuman Princess Crystal, Inhuman Princess has serious potential as a competitive commander because it brings four colorsincluding all-important access to blueplus a triggered ability win condition
While we've had some commanders like Davros and Tivit make use of it, Cirdan from the Lord of the Rings Elf Commander deck uses diplomacy to give your opponents lots of treats