Baird, Steward of Argive

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, planeswalker, or battle 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.