Among the massive number of keywords is trample, which ensures your creatures deal damage to players
Though for a five-colored Legendary creature, Id still prefer using The Ur-Dragon because he has more utility at the expense of having a higher mana cost
For the rarity table below, I have designated the baby shinies as SPa, the Shiny Pokmon-GX as SPb and the Shiny Vault full art Trainers and full-gold cards SPc: image949536 15.6 KB A note on rainbow rare Moltres, Zapdos & Articuno GX: I have no indication it is significantly rarer than the two full art Trainers
Expanded cards enable tournament participation
Illustrated by Ryan Pancoast Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
For example, a ramp or control core, both of which are good at getting to a spot in the game where you can cast your pricy spells