Creature â Elemental Warrior
Gaea's Protector must be blocked if able.4/2
The defending player, not you, chooses which creature blocks Gaeaâ€™s Protector.
Only one creature is required to block Gaeaâ€™s Protector. Other creatures may also block it, and are free to block other creatures or not block at all.
If each creature the defending player controls canâ€™t block for any reason (such as being tapped), then Gaeaâ€™s Protector isnâ€™t blocked. If thereâ€™s a cost associated with blocking Gaeaâ€™s Protector, the defending player isnâ€™t forced to pay that cost, so it doesnâ€™t have to be blocked in that case either.