Calculations are based on 4 SoFr's for easy calculation.
Evasion = Semi immaterial. In comparison to immateriality, it has its pros (still buffable with a wide range of spells) and cons (RoF and Thunderstorm). This is a huge thing. Quintessence costs 4|3, and blessing 3|3 buff costs 3|2. In comparison with nightfall, which costs 3|4 and gives 1|1 | 2|1, a spell spread on creatures theoretically has its effects diminished by 2/3. A buff comparable to quintessence (let's assume ~3|~2 cost) spread on air creatures should have 3 cards + ~9|~6 elemental cost.
Critical strike = 1.5x damage + shield bypass. Let's just assume airborne creatures have 6 damage on average (dragons, don't argue!). This has a value of 3 damage + shield bypass. In comparison with Chaos Power + Momentum, which is 2 cards +

+

for 4|4 + shield bypass, 100% critical strike should cost around 2 cards + 1 elemental cost. Spread it again (this time, on airborne creatures, which has a wider range compared to only

for Nightfall|Eclipse) and you get 6 cards + 3 elemental cost.
And a grand total of 9 cards + ~12|~9 elemental cost for 4 cards + 20|12 rainbow cost. Silly.
And note that I was very forgiving on my calculations there.