Agility Bobblehead

{T}: Add one mana of any color.
{3}, {T}: Up to X target creatures you control each gain haste until end of turn and can't be blocked this turn except by creatures with haste, where X is the number of Bobbleheads you control as you activate this ability.

Fallout

Activating Agility Bobblehead’s last ability targeting a creature that has already been blocked by a creature without haste won’t cause that creature to become unblocked.

You choose how many targets Agility Bobblehead’s last ability has as you activate the ability. Once you do, it doesn’t matter what happens to any Bobbleheads you control.