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Vigilance
Creatures can't attack you or planeswalkers you control unless their controller pays {1} for each of those creatures.
If you control Baird, your opponents can choose not to pay to attack with a creature that attacks “if able.” If there’s no other player or planeswalker to attack, that creature simply doesn’t attack.
In a Two-Headed Giant game, creatures can attack your teammate and planeswalkers your teammate controls without requiring a mana payment. This is a change from previous rules.
