The Undercity

{b}{b}{b}{t}: Regenerate target creature under
your control
Flying creatures can not attack you
{b}{b}{b}{b}{t}: Put a 4/3 Undercity guard token into play. This creature has "{b}: Trample,
{b}{b}: Regenerate
{b}{b}{b}{b}{t}: Sacrifice a creature in play to search your library for Sylvannas Windrunner and put her into play as though just summoned