River Delta

Land -
River Delta doesn't untap during your untap step if it has a depletion counter on it. <CR>
At the beginning of your upkeep, remove a depletion counter from River Delta. <CR>
{T}: Add {U} or {B} to your mana pool. Put a depletion counter on River Delta.

Land -
River Delta doesn't untap during your untap step if it has a depletion counter on it. <CR>
At the beginning of your upkeep, remove a depletion counter from River Delta. <CR>
{T}: Add {U} or {B}. Put a depletion counter on River Delta.

Land -
{T}: Add {U} or {B} to your mana pool. River Delta doesn't untap during its controller's next untap step.

Land -
River Delta doesn't untap during your untap step if it has a depletion counter on it. <CR>
At the beginning of your upkeep, remove a depletion counter from River Delta. <CR>
{T}: Add {U} or {B} to your mana pool. Put a depletion counter on River Delta.