Cthulhu Rising

Unblockable
{4}{u}{u}{u}: Monstrosity 4. (If this creature isn't monstrous, put four +1/+1 counters on it and it
becomes monstrous.)
When Cthulhu Rising becomes monstrous, it has hexproof and you may tap up to seven target creatures. Those creatures don't untap during
their controller's next untap step.