Once Aurelia's last ability has resolved, the creature keeps whatever bonuses it got from that ability even if its colors change
As characters receive damage counters, healing them is the best way to ensure they stick around for the long haul
It has a size of 7 mana or more, and since its toughness is exactly 7, it's great that it just barely dodges the 'removal for toughness 6' found in Red and Black
However, Blue-Eyes Ultimate Dragon can be cheesed out in various formats
Once you finish looking past the hodgepodge pile of free spells, you then start to notice the many cantrip spells
This can be made easier by cheating the cards out somehow, but the way the card was intended to be used when the cards were made was that you would Normal Summon Aitsu, a Level 5 Normal Monster with 100 ATK and DEF, protect it enough until you could tribute 2 more Monsters to summon Koitsu and then attach Koitsu to Aitsu