Miro's wards

Whenever a creature attacks you or a
planeswalker you control you may pay {x}. If you
do, that creature's controller may pay {x}. If they
don't remove that creature from combat. For
every rune you control, that creature's controller
has to pay an additional {2}.
{t}, {5}: Create an artifact rune token named rune.
(It has '{t}, Sacrifice this artifact: target creature
gains +0/+4 and hexproof until the end of the turn.')
Every vigilant, the runes watch over the grove.