Creatures can't attack you or planeswalkers you control unless their controller pays {X} for each of those creatures, where X is the number of enchantments you control.
$23.00 $13.80
$8.99 $5.39
$62.00 $31.00
$22.00 $13.20
$12.00 $8.00
$10.00 $5.00
$13.00 $5.00
$13.00 $9.00