How can you create a combo with Shadowspear, Harmless Offering, Lich's Mastery?
user
[START OF COMBO]This combo can be formed with Shadowspear, Harmless Offering, Lich's Mastery

Color identity: BR
Mana cost: {3}{R}
Steps:
  1. Cast Harmless Offering by paying {2}{R}, giving an opponent control of Lich's Mastery.
  2. If needed, activate Shadowspear by paying {1}, causing all permanents your opponents control to lose hexproof and indestructible until end of turn.
  3. Cause Lich's Mastery to leave the battlefield.
  4. Lich's Mastery triggers, causing its controller to lose the game.[END OF COMBO STEPS]

Result:
  - Target opponent loses the game[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Shadowspear must be on the battlefield
  - Harmless Offering must be in your hand
  - Lich's Mastery must be on the battlefield
  - You have a way to cause Lich's Mastery to leave the battlefield.
[END OF COMBO PREREQUISITES]
assistant