Calciform Pools
Land
: Add 
.
, : Put a storage counter on this land.
, Remove X storage counters from this land: Add X mana in any combination of 
and/or 
.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL