Xander, the Rocking Warrior

Whenever Xander, the Rocking Warrior is blocked,
untap each creature you control. After this phase,
there is an additional combat phase.

{2}{r}{r}{g}{g}: Xander must be blocked each combat
this turn if able.

{1} RockWorld, each player deals 1 rock damage to
target opponent and 1 rock damage to target creature.