Bursh, Voice of Null

Whenever a player taps a land for mana, that
player adds {c}. Each opponent loses 1 life for
each unspent mana they lose.
{w}{w}: Target creature becomes base power and toughness 1/1 until end of turn.
{u}{u}: Counter target creature ability.
{b}{b}: Target non-basic land is a swamp.
{r}{r}: Deal 1 damage to any target.