The Warstone

The Warstone can't be countered.
Indestructible
Tap an untapped creature you control, choose one:
- You gain X life, where X is the tapped creature's toughness.
- The Warstone deals X damage to target creature or Planeswalker and X damage to you, where X is the tapped creature's power.
- The Warstone becomes an Elemental Incarnation with Trample and Haste and power and toughness each equal to the number of tapped creatures you control until end of turn