Deathtouch creatures make every combat step a dangerous proposition, while your removal keep opponents on the defensive
Rootha, Mastering the Moment Rootha, Mastering the Moment is an easy one to get behind because hasty evasive tokens can be a win condition on their own
Ajani, Outland Chaperone does less buffing, but generates lots of little creatures and has some of white's conditional removal
Suddenly, each 1/1 deathtouch for 1 mana becomes a threat, effectively having toxic 2, so to speak
However, the counter-target spell card was experiencing problems with Cascade and drastically decreasing the fun of metagames
Cheat out Items at a cheaper cost through Belle, Inventive Engineer