Baird, Steward of Argive

Oracle Text
Vigilance
Creatures can't attack you or a planeswalker you control unless their controller pays
for each of those creatures.Card Rulings
4/27/2018 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.
4/27/2018 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.
Plus, it's fairly useful tech for Captain Sisay (though Elesh Norn, Grand Cenobite generally fills the same purpose against decks that would swarm).