Obsidian Destroyer

Reach, Trample, Undying
{r}{b/r}: Put a Blaze counter on target land you do
not control. For as long as that land has a
blaze counter on it, it has "At the beginning of
your upkeep, this land deals 1 damage to you."
{r/g}{r/g}{1}: Search your library for a basic land equal
to half the number of blaze counters upon the battlefield rounded up.