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Rulings
Whether you control a Goblin or Orc matters only at the time you declare blockers. Once Olog-Hai Crusher blocks a creature, that won't change even if all the Goblins and Orcs you control leave the battlefield.
The Goblin or Orc you control doesn't have to block.
The Goblin or Orc you control doesn't have to block.
Rulings
Whether you control a Goblin or Orc matters only at the time you declare blockers. Once Olog-Hai Crusher blocks a creature, that won't change even if all the Goblins and Orcs you control leave the battlefield.
The Goblin or Orc you control doesn't have to block.
The Goblin or Orc you control doesn't have to block.
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