I feel I should point out that the damage will never have a chance to kill this creature, even if it's 1/1. The damage is dealt just before the bond counter goes on, so there'll be a brief moment when it has 1 toughness and 2 damage, but state-based actions are only checked after resolution has finished, by which time the creature will have +5/+5.

How would I word it so that it could kill a creature "not worthy/strong enough to become a Rider"?

Hmm. You could do something like:

> When ~ ETBs, put a bond counter on enchanted creature.
> If enchanted creature does not have a bond counter on it, it gets -2/-2. If it does, it gets +5/+5 and has flying, [some blue ability instead of first strike], and "Whenever ~ attacks, scry 1."

(Also changed away from giving a tap ability to a huge flyer, because players want to attack with their huge flyers, not tap them for a tiny benefit.)

That wording might confuse new players, but mythics don't have to worry about that so much.

1. Destroying creatures isn't in blue's slice of the pie.
2. The creature will almost certainly have greater than 2 toughness when it's trigger occurs, since the Aura itself gives +5 to toughness.

It's a color bleed, the wording worked before, I edited it but you're right it doesn't work now.

So you're justifying the color break by calling it a bleed?

It's necessary for the flavor. Magic has made some huge bleeds, like Form of the Dragon, Beast Within, and Chaos Warp.

Form of the Dragon is an interesting example. That's always justified as "Moat isn't red. But 'I turn into a dragon' is very very red. And ground creatures can't attack dragons." However, it's very much the exception. Most cards should be colour-pie-appropriate. "I turn into a dragon" is one where they decided the flavour was so much better in mono-red than in red-X that it was worth the colour pie break.

So: I don't know the Eragon series. What does "Gedwëy Ignasia" mean? What does it do? And crucially, what alignment with Magic's colours does it have? Could it be blue-black, or blue-red, or red, or white-red? If not, then what about it is so utterly, inescapably blue, far more so than any other colour, that it justifies one of these very rare, very controversial, major breaks of the colour pie?

Explain to us what this card is about, and whether it could be gold; and if not then what makes it so very, very blue.

The Gedwey Ignasia is a magical symbol of some sort that is branded into one's hand the first time he or she touches a dragon. This enables a telepathic bond with the dragon, but causes some pain initially, however, it's not really red. It's definitely not black, and possibly could be white, but really, the main flavor is a mysterious magical symbol whose exact properties are unknown that binds a Dragon and a Rider.