Shadow Realm

Hexproof, Shadow Realm can't be countered.
Hostile (Shadow Realm acts like a creature with defender, meaning it can assigned to block.)
Shadow Realm taps for up to {5} of each color. Untap once per turn.
Shadow Realm's power is equal to how many permanent are in all graveyards.
Shadow Realm's toughness is equal to your highest life total this game.
{0}, {t}: Draw a card and destroy target creature without shadow.