Blast Zone
Land
~this~ enters with a charge counter on it.
{T}: Add {C}.
{X}{X}, {T}: Put X charge counters on ~this~.
{3}, {T}, Sacrifice ~this~: Destroy each nonland permanent with mana value equal to the number of charge counters on ~this~.
Tendo Ice Bridge
Land
~this~ enters with a charge counter on it.
{T}: Add {C}.
{T}, Remove a charge counter from ~this~: Add one mana of any color.