He is good for two primary reasons: flexibility and trading up in value.
The ability to choose which card you want from him on play is extremely strong due to the potential value of his cards.
If you do opt for the simple blue card, even a mystic shot, the best way to remove him, is a fine trade for you. You traded one mana for card advantage, which is typically better for you anyway.
In addition to all of that, he threatens to win the game almost on the spot if not dealt with due to the raw power of his level up. Virtually no weaknesses makes for a very powerful champ.
He is good for two primary reasons: flexibility and trading up in value.
The ability to choose which card you want from him on play is extremely strong due to the potential value of his cards.
If you do opt for the simple blue card, even a mystic shot, the best way to remove him, is a fine trade for you. You traded one mana for card advantage, which is typically better for you anyway.
In addition to all of that, he threatens to win the game almost on the spot if not dealt with due to the raw power of his level up. Virtually no weaknesses makes for a very powerful champ.
Remove attune from blue card.