Sundial, Dawn Tyrant Sundial is an inscrutable walking construct that has traveled the ever-changing landscapes of Muraganda since time immemorial, revered by its followers, the Dawnchaser Pilgrims
(Each in the mana costs of permanents you control counts toward your devotion to black.) Creature - Zombie Color tag templates(None) Ichor Rats Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.) When this creature enters, each player gets a poison counter
Black can wipe the board of creatures all day long, but not being able to remove other problematic permanents like enchantments or artifacts can be a real problem for the color
In the same scenario, if you have a Detention Sphere and a Jace, Architect of Thought, you would have a difficult decision to make about whether to spend your next turn answering the Zombie or playing a contested planeswalker, whereas with Heros Downfall you can harness a tempo advantage by killing the Lifebane Zombie, untapping, and playing Jace to safely draw cards on an open board