Hladnyr, Stone Bulwark

Hladnyr, Stone Bulwark enters with 100 Life.
Players can't lose or gain life.
If a player would lose life, Hladnyr takes the
damage in their stead.
Creatures may {t} to lay siege to Hladnyr, Stone
Bulwark, dealing damage to it equal to their power.
{2}{w}: Each player creates a 3/2 white Dwarf.
{3}{u}: Each player draws 3 cards, then mills 5.
{5}{b}: Each player returns a creature from the graveyard to the battlefield tapped.