ADVENTURERS! MtG cards!

Hannibal Wrote:I don´t get what those symbols mean,

The circles refer to light, gray, and dark mana, which are the colors in CMC. The star is CMC's dizzy (equivalent to MtG tap) symbol. The arrow signifies an activated ability (this is not marked in MtG). So, means that you can play the ability by tapping the card and paying one mana. Above the card name the first line refers to the play cost, and the second to something that doesn't exist in MtG and isn't really relevant.

Hannibal Wrote:The problem was that both blades seem identical except in different colors

Look carefully. Mugendai-Yaiba depends on your life, while Kyuukyoku-Yaiba depends on your opponent's life. (Or in a more-than-two-player MtG game, target creature's controller's life.) I do think depending on creatures' life (the one wielding the sword or the one being hit, depending on the sword) would be better flavorwise than depending on players' life, although that could get tricky with Kyuukyoku-Yaiba. There could even be a case made for depending on attack (or total mana cost?) rather than life, as Eternion seemed to have the same the same hitpoint meter in both forms, but Argent's blade would supposedly hit him harder as Eternity.

Kyuukyoku-Yaiba granting first strike makes little sense, as supposedly Eternion started the war and the others fought for defense.

Hannibal Wrote:And in one of those comics you pointed me out, I found something that reassures me in the fact that termis should be the five color Eternal. In here Ardam says that Termis has abilities from every other eternal.

Well... yeah. I sorta assumed everybody knew that already.

Here's the other Eternals' titles and roles, which may also help:

Maxima Termis, Grand Eternal
Eternion, Knight, Eternal of War
Invisin, Assassin, Eternal of Misdirection
Infinel, Messenger, Eternal of Peace and Order
Imposis: never mentioned, but he knows magic and seems to prefer manipulating others to fighting himself
Endless, Teacher, Lesser Eternal of Instruction

Infinel is also stated to know weaponcraft, and is most likely the one who forged Kyuukyoku-Yaiba (and possibly the one who wielded it) and may have made Longinus himself too.

Since we have five eternals besides Grand (excepting Finis who is a mere flowgem recruit), we may want to assign one color to each, although arguably Endless might not deserve a color of his own, being merely a Lesser Eternal (under Imposis). Eternion = red, Imposis = blue, and Infinel = white are fairly obvious, and Invisin is black if we decide to ignore her aura color, which leaves green for Endless.