Ara, Mysterious Arbiter

Whenever another creature attacks, detain it at
the beginning of your next upkeep. (Until your
next turn, that permanent can't attack or block and its activated abilities can't be activated.)
Whenever you detain a creature, draw a card,
then put a +1/+1 counter on Ara and each
detained creature you control.
Detained creatures you control have hexproof
and indestructible.