Since youll pay life rather than mana to cast opponents spells, youll need lifegain effects, something that black cards have plenty of: Gray Merchant of Asphodel or Sheoldred, the Apocalypse balance out the life costs for casting opponents cards you exile after combat damage
Although your opponent will still gain life, their creature will also die
Standard is now at a level where only two types of cards seem to see play: new cards that make an existing archetype stronger, or cards that are so strong that they can break through in much more powerful formats
Creatures with deathtouch lessen an opponents desire to block so that they can keep their best creatures, which means you have the potential to accumulate the number of poison counters an opponent gets from infect or toxic creatures
The following Q&A has been editorialized and lightly trimmed for better flow
I'd also advise not letting your opponent spin a coin, because the heads side is slightly heavier and can result in a disproportionate number of tails coming up