Two factors when going about determining the sweet spots for Adren.
1: the total damage done with a target+adren.
2: how much damage Adren adds.
Yes, you quadruple damage at 1 and 2 attack, but you only end up with 4 or 8 damage done. 2 isn't terrible since you're getting 6 damage from Adren; in other words a good cost:attack ratio, but at 3 attack you get 9 attack. The formula for 4, 5, 7 and 8 is x2(+1), so you get +5, +6, +8 and +9 respectively. From that you can see that 7 and 8 are the second best sweet spots, with 8 yielding as much as it does for 3 attack.
Anything above that has comparatively terrible yields, however even getting 4 or 5 attack for a 4 or 3 cost card isn't terrible on paper. It's just a bad idea because there are better targets that cost less, which means you'd be less weak to soft CC.
Heal is the go-to card for EM'ing with Imp. Miracle, so it's used a fair bit in controlbows. However, so is Forest Spectre and Giant Frog. Those three are all strong cards, with Scorpion and Epi being good enough to be used as well, but they have far more niche effects (Elite Cocka is solid as well, albeit lower potential). Statistically speaking, Spectre or Giant Frog would be the strongest.
Other points have been discussed more than enough in my presence, so I don't feel a need to repeat the points themselves. I will simply agree that Aether is OP, Life is UP and that "Additional Card Cost [ 1
]" is more like an exponential formula that scales with how much value the card has. For instance, Elite Phase Dragon has 10 attack and thus not having to play Quint on it is worth more than 1
. 2 is clearly fair if we look at how balanced EPD is in the meta, and I wouldn't even mind if it costed 15
. In the same vein, Immortal and Elite Immortal are overshadowed precisely because they don't have enough card value.
