Elemental Mastery + Black Carriage

Elemental Mastery
Black Carriage

Elemental Mastery must be on the battlefield. Black Carriage must be on the battlefield. Elemental Mastery attached to Black Carriage.
  1. During your upkeep, activate Black Carriage by tapping it, creating at least four 1/1 Elemental creature tokens.
  2. Activate Black Carriage by paying 0 and sacrificing an Elemental token, untapping Black Carriage.
  3. Repeat.
Infinite creature tokens with haste. Infinite ETB.