508.1d ..... If a creature can't attack unless a player pays a cost, that player is not required to pay that cost, even if attacking with that creature would increase the number of requirements being obeyed.
508.1d is the right rule to quote, but also note that Bident of Thassa and similar effects say the creature(s) must attack "if able". If the optional cost for Sphere of Safety isn't paid, then the creature isn't able to attack.
What happens in a multiplayer game? Is the player forced to attack someone else or can he declare the attack on the player with the sphere and choose not to pay to avoid attackin altogether?
What happens in a multiplayer game? Is the player forced to attack someone else or can he declare the attack on the player with the sphere and choose not to pay to avoid attackin altogether?
Please use card tags when posting in Rulings. Thank you for your cooperation. Card tags added.
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Bident of Thasa
Sphere of Safety
Moved to Rulings and tagged cards added