In return, you are able to create a Hero Token which acts as a creature with 1 Power and 1 Life, but you are able to put as many counters on it for each life you paid which increases both by 1 per counter
If you want to control the board, Sphere of Safety is a massive help since most decks can't afford to pay 3+ mana a creature to attack you
Ive seen games where Blood Moon landed on turn three, and half the table just stopped functioning
Let's rank all "You win" cards by level of difficulty, from impossible to too easy
They use a slight variation of the grading system that most players are familiar with, but its intuitive
Theres very little your opponents can do to stop this scenario once it's in place, short of a mass exile spell like Sunfall or Farewell