Giving an opponent a choice is never a good idea. However I really feel like it's win win here in the aggressive deck. A 4/3 for one will almost always be worth a card. So the real question is - is it worth a card to deal 4 damage for a red? It's not quite Flame Slash good in a control deck, or as great top deck as Thunderous Wrath but better than Thunderbolt or Lava Axe.
19. Scute Mob
Not a true one drop. But by turn six hopefully you are going get a hydra-like insect that will quickly get insanely huge if not dealt with. My biggest issue is that it doesn't have trample. It's still a great costed creature that can do some work if unchecked. There are lots of ways to give it Trample in Green not named Rancor.
18. Dragonmaster Outcast
And yet another non-true one drop. If you can stay…
One drops are the least important thing in any draft or sealed pool. You shouldn't play them pretty much ever. They typically do little for you, don't fit random cards, or just suck. And why should they, you aren't expected to win the game by turn 1(not counting you Legacy). In constructed, it's a whole different ball game. You have these cheap cards that actually interact with other cards in your deck. Not only that - your selection is a lot wider and if you look deep enough, you can find cards that can really put the pressure on.
The number 100 just kind of worked out. There are approximately 600 one costed creatures, and I honestly only checked out about 400 of them - top half and the very bottom(maybe I trust The Gatherer too much, but I'm always open to suggestions!). I found 95 that I really liked just naturally. The other 5 are included as my bottom 5, but 100 of course just sounded better.
I could have forced myself to get 5 more, but there are essentially…
Illusionary Mask combo aside, a 12/12 Trample for one is certainly an interesting idea. At some point in the game you will have some 1/1s or even 2/2s that you don't need, maybe something get's Pacifism'd. Then you have a real card capable of becoming the largest threat on the board that will end the game in two turns unless dealt with. It does have quite the possibility of ruining your entire game plan if it gets Doom Blade'd or something. There are other ways to abuse it - Torpor Orb, Pandemonium, Fling.
79. Kor Duelist
Requiring equipment for it to be useful is a drawback, but for one mana you get the possibility of a double striking monster. Even if you could give it +2/+0 or heck Loxodon Warhammer then you get a fantastic deal for a single mana. Put it in a deck with the Swords and just go to town. A turn two Bonesplitter will hit for six.