Even drawing four new cards can be quite powerful, especially if youre using a deck that consistently empties all of its resources quickly
Although black can reduce a player's life total directly, most notably with cards like Bump in the Night, and although those cards often are put into decks named burn in some ways, thats a very different effect
There are a few that buck the trend and focus on artifacts, spellslinging, and a few other archetypes, though they often approach these strategies in a very Gruul way
Vampiric Tutor, Mystical Tutor, Enlightened Tutor, and Imperial Seal are cheaper to cast, but place the card atop your library rather than in hand
The Scorpion God is powerful, viable, and fun, but the most common question I see is whether it or Hapatra, Vizier of Poisons is the better commander
They restrict resources like mana and cards : Look no further than Smokestack or even Tangle Wire as examples