If you have a good board and some mana, Setessan Tactics will deliver kills
Firion, Swordmaster (Sram, Senior Edificer) Rating: 4/10 Sram, Senior Edificer is a little hard to build around in Limited, but there are quite a few nice equipment cards that we want to get into our decks
You then end up with a 3/4 Vigilance Wolf, which attacks and blocks great for that stage in the game
On the other hand, the Surveil ability of DRC helps both with enabling Delirium and represents incredible card filtering to the point in which you dont play with bad cards from the top of your library anymore
One mana for that level of consistency is ridiculous
The idea was to cast a Kird Ape with a forest in play (for a 2/3 creature), then give it Giant Growth for a 5/6, then use Berserk to make it 10/6, then Fork the Berserk to get a 20/6 game-winner for just 4 mana