I like Scry a lot and keywording War Drums is nifty so this is cool by me. A little sad we didn't see replacements for Regen. and Prot. but what can you do.
Even though I like Regenerate quite a bit at this point I'd
much rather they get rid of it and give Black a new keyword that they would actually use more frequently. Out of 138 black creatures in standard only 6 have Regenerate and the only Standard playable one is Rakshasa Deathdealer, a gold card.
Prowess: Blue > Red > White
As for Black vs. Red in creature mechanics
Regenerate, Deathtouch, Lifelink, Haste, Flying, Trample, Menace
vs
First Strike, Double Strike, Prowess, Haste, Flying, Trample, Menace
Seems about equal to me unless I'm forgetting anything
Here's the # of creatures per keyword (or potentially gaining the keyword through activation) in Standard:
Black
Regenerate: 4 mono, 2 gold
Deathtouch: 15 mono, 2 gold
Lifelink: 3 mono, 3 gold (one of which is Chromanticore)
Haste: 1 mono, 5 gold (plus 8 Dash creatures)
Flying: 25 mono, 15 gold (includes Chromanticore)
Trample: 1 mono, 2 gold (Chromanticore)
Menace: 1 mono
Red
First Strike: 7 mono, 5 gold (Chromanticore)
Double Strike: 3 mono, 1 gold
Prowess: 3 mono
Haste: 15 mono, 6 gold (plus 11 Dash creatures)
Flying: 16 mono, 15 gold (Chromanticore)
Trample: 12 mono, 9 gold (Chromanticore)
Menace: 4 mono, 1 gold
I tried to remove the Tribute cards and a few cards that require incredibly difficult steps to gain the keywords but that's approximately the distribution. Red sees considerably more use of it's keyword pie in non-creature spells of course but that's probably to be expected considering the color and the combat trick effectiveness of their keywords..