MArcomage

Too expensive compared to its rarity and the potential damage it can do. Perhaps allow mode 2 to summon rare card?

Good idea. Also I slightly tweaked attack.
I think that 40 attack in mode 2 (with all conditions) is good for Beast/Frenzy. But I'm not sure about Swift keyword...

well the card is still frenzy so I don't think you want it overtweaked. It's good as it is now. Instead of Swift, perhaps make it Quick