Undercity Plots

When Undercity Plots enters the battlefield,
surveil 2.
{b/g}, Sacrifice Undercity Plots and another
creature: each opponent loses 2 life and you
gain 2 life
{x}{g}{b}: Undercity Plots gains dredge X
until end of turn. Activate only if Undercity
March is in your graveyard.