Deep Water

Until end of turn, if a player taps a nonbasic land for mana, it produces colorless mana instead of any other type.

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

If tapped for mana, Plains produce , Swamps produce , Mountains produce , and Forests produce instead of any other type.

: Choose a basic land type. Each land you control becomes that type until end of turn.

: Target land you control becomes the basic land type of your choice until end of turn.

, : Untap target artifact an opponent controls and gain control of it until end of turn. It gains haste until end of turn. When you lose control of the artifact, tap it.

: Target creature gets -X/-0 until end of turn, where X is the number of Merfolk and/or Faeries you control.